LEGO 42703 Mermaid Roller Coaster is an upcoming Friends set with an expected retail price of $109.99, expected to release on August 1, 2026. Pre-order prices on the secondary market are currently around $129.

Forecast Model

This represents the expected annual growth (CAGR) based solely on a forecast model.
LEGO 42703-1 Mermaid Roller Coaster is a LEGO Friends set released in 2026, featuring 5 mini-dolls. The build centers on a working roller coaster that travels around a rotating mermaid pool, with amusement park details including a ticket entrance, park map, and photo area. Included characters are Autumn, who has a double-sided face with an alternate expression, and the mermaids Serina and Azuria, both with opalescent hair. The set combines a fairground ride with a mermaid-themed performance area.

For Sale (New/Sealed)

(US) Official LEGO pre-order Mermaid Roller Coaster
BrickEconomy Choice
$109.99
(IT) 42703 Friends Mermaid Coaster $116.78
(IT) Friends 42703 Little Mermaid Roller Coaster $121.46
(NL) 42703 Mermaid Roller Coaster Ride - [ New. ] $128.35
(KR) Friends 42703 Mermaid Roller Coaster Ride Building Set $131.03
(IT) New LEGO 42703 FRIENDS Mermaid Roller Coaster Builds $146.90
(IT) Gadget - LEGO: 42703 - Friends - Montagne Russian Della Sirenetta - D - Lego $151.68

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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...
Description provided by LEGO©