BricksValue

LEGO Mermaid Roller Coaster Ride (42703)

Friends · 864 pieces · 5 minifigures

From £71.99 at Kidinn · 20% off

Not retiring yet (on sale since 2026)

LEGO Mermaid Roller Coaster Ride (42703)
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Compare prices (UK)

Regular price £89.99

See it at Kidinn, £71.99

Buy now: That’s the lowest price we’ve recorded here since 8 October 2026.

. Amazon offers can be third-party (marked).

Similar sets with bigger discounts

Price history

Lowest price today
£71.99
at Kidinn
Lowest we’ve recorded
£71.99
Amazon.co.uk, 10 Oct 2026
LEGO’s regular price
£89.99
today’s lowest is 20% off
Tracked since
8 Oct 2026
11 price changes since
Price records (19)
  • 23 October 2026 · Kidinn£71.99
  • 22 October 2026 · Kidinn£72.49
  • 21 October 2026 · The Entertainerout of stock£75.00
  • 21 October 2026 · The Entertainer£75.00
  • 20 October 2026 · Kidinn£80.99
  • 20 October 2026 · The Entertainerout of stock£75.00
  • 20 October 2026 · Kidinn£85.99
  • 19 October 2026 · Veryout of stock£71.99
  • 14 October 2026 · Kidinnout of stock£86.49
  • 13 October 2026 · Kidinn£86.49
  • 13 October 2026 · Very£71.99
  • 13 October 2026 · Very£62.99
  • 10 October 2026 · Amazon.co.uk£71.99
  • 10 October 2026 · Argos£72.00
  • 10 October 2026 · John Lewisout of stock£89.99
  • 10 October 2026 · Smyths Toys£71.99
  • 8 October 2026 · The Entertainer£75.00
  • 8 October 2026 · John Lewisout of stock£72.00
  • 8 October 2026 · LEGO.com UK£89.99

Prices at LEGO.com UK, Amazon.co.uk, Argos, Smyths Toys, Very, John Lewis, The Entertainer and Kidinn, checked daily. A line breaks when a store was out of stock or not selling the set.

LEGO Mermaid Roller Coaster Ride in other countries

The lowest price today in each country where LEGO sells it, converted at the European Central Bank’s rate. Delivery across borders isn’t included: most stores only ship inside their own country.

CountryLowest priceIn GBP
Show all 13 countries

Exchange rates of 22 October 2026.

Set details

Pieces
864
Minifigures
5
Ages
8+
Released
2026
Set number
42703
Theme
Friends
Price per piece
8.3pat today’s lowest price
LEGO.com rating
4.9
LEGO Insiders points
720

LEGO Mermaid Roller Coaster Ride building instructions

Official instructions from LEGO.com, free to download. The LEGO Builder app has them too, many with 3D steps. All instructions on LEGO.com

LEGO Mermaid Roller Coaster Ride parts list

854 pieces in 236 different parts and colors, plus 5 minifigures.

Minifigures

  • Autumn, Blue Plaid Shirt, Medium Lavender ShortsAutumn, Blue Plaid Shirt, Medium Lavender Shorts
  • AzureaAzurea
  • Leo - Dark Pink Jacket, Yellow PantsLeo - Dark Pink Jacket, Yellow Pants
  • Liann - White Top, Bright Light Orange SkirtLiann - White Top, Bright Light Orange Skirt
  • SerinaSerina
  • Plant, Flower, Plate Round 1 x 1 with 5 Petals, Bright Light Orange×3824866
  • Brick Round 2 x 2 with Axle Hole, Tan×343941
  • Brick Sloped 45° 2 x 1 with Bottom Pin, Medium Lavender×213040b
  • Plate 2 x 2, Pearl Gold×203022
  • Brick 1 x 4, Medium Lavender×183010
  • Plate Round 1 x 1 with Open Stud, Lime×1585861

Parts list: Rebrickable.

About the LEGO Mermaid Roller Coaster Ride

Make playtime extra thrilling with the LEGO® Friends Mermaid Roller Coaster Ride (42703) building set for kids ages 8 and up. This fun gift idea for girls and boys lets young builders create a working roller coaster and send it zooming around a rotating pool where beautiful mermaids swirl and perform. This exciting, functional playset comes with lots of accessories and 5 minidolls, including Autumn, whose face can be swapped to show relaxation or excitement, and 2 mermaids, Serina and Azuria, who both have opalescent hair. Amusement park lovers can find endless ways to enjoy this roller coaster building set with themed details at every turn, including a ticket entrance, park map, photos and lots more. Kids can enjoy intuitive building with the LEGO Builder app, zooming and rotating with 3D instructions, while saving and tracking progress – all from the app. Set contains 864 pieces.
  • ROLLER COASTER BUILDING SET – Let the good times roll with this LEGO® Friends Mermaid Roller Coaster Ride (42703), which includes 5 minidolls and lots of themed accessories
  • FUNCTIONAL AMUSEMENT PARK RIDE – Kids can have lots of fun role-playing a thrilling day out, taking the minidolls for a ride on the working mermaid-inspired roller coaster toy
  • 5 CHARACTERS – Change up the Autumn minidoll’s face to reflect her excitement as she explores the park with Leo and Liann; discover 2 shimmering mermaid toys for endless fun
  • CREATIVE ACCESSORIES – Inspire storytelling and imaginative play with themed accessories, including bubble tea, a photo strip, sea animals, a LEGO® piece narwhal toy plushie and more
  • GIFT IDEA – This mermaid toy for girls and boys makes a great holiday or birthday gift for kids ages 8 years old and up who love pretend play and roller coasters
  • MAKE MORE FRIENDS – Discover more fun with other sets (sold separately) and the LEGO® Friends: The Next Chapter online show, where kids get to know the characters of Heartlake City
  • A HELPING HAND – Follow digital instructions in the LEGO® Builder app, where kids can zoom in and rotate models using 3D instructions, track their progress and save sets as they develop new skills
  • DIMENSIONS – The roller coaster in this 864-piece set measures over 7.5 in. (19 cm) high, 20.5 in. (52 cm) wide and 11 in. (28 cm) deep

Description: LEGO.com.

LEGO Mermaid Roller Coaster Ride: FAQ

Is the LEGO Mermaid Roller Coaster Ride retiring?

Not yet: the LEGO Mermaid Roller Coaster Ride isn’t flagged as retiring. LEGO.com UK doesn’t list it as “Retiring soon”. We check every day and will update this page the day that changes.

How much is the LEGO Mermaid Roller Coaster Ride?

The lowest price we found today is £71.99 at Kidinn, out of 4 stores selling it today (regular price £89.99). Prices change often: this page is updated every day.

Should I buy the LEGO Mermaid Roller Coaster Ride now or wait?

20% off at Kidinn. The best price today is £71.99 at Kidinn, 20% below LEGO’s regular price. That’s the lowest price we’ve recorded here since 8 October 2026.

Where can I find the instructions for the LEGO Mermaid Roller Coaster Ride?

LEGO publishes them for free on LEGO.com as 2 PDF booklets, linked on this page, and in the LEGO Builder app.

How many pieces are in the LEGO Mermaid Roller Coaster Ride (42703)?

864 pieces and 5 minifigures. At today’s price, that’s 8.3p per piece.

When was the LEGO Mermaid Roller Coaster Ride released?

It was released in 2026.

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