Ariel's Undersea Castle (10515-1) is a LEGO Duplo set released in 2013, currently averaging $35.82 used on BrickLink. It comes with 1 minifigure worth a combined $4.56. The set has retired from retail, so secondary market is the only option. The full parts inventory runs 30 pieces.
The minifigures make up only 13% of this set's value ($4.56 out of $35.82). The bulk of the value is in the parts or the set being complete. Sell it as a complete set if possible.
Ariel's Undersea Castle sells for an average of $35.82 used and $66.45 new/sealed on BrickLink based on 6 months of completed sales. As a retired set, prices tend to hold steady or appreciate over time, especially for complete sets with original packaging. Actual prices vary with completeness. Missing minifigures or key parts will lower the value.
This set includes 1 minifigure: Duplo Figure, Disney Princess, Ariel, Bright Green Tail (Mermaid) (6044057 / 6137858) ($4.56). The minifigures have a combined BrickLink value of $4.56. Each figure is linked above with individual pricing if you're looking to buy or sell specific characters.
The minifigures make up about 13% of the set value ($4.56 out of $35.82). Most of the value is in the complete set package, so selling it whole is likely the better move unless you have buyers lined up for specific figures.
Yes, Ariel's Undersea Castle was released in 2013 and has been retired from retail for several years. Retired LEGO sets are only available on the secondary market through BrickLink, eBay, or other resale platforms.
Use the parts list on this page to check every piece and all 1 minifigure. For the minifigures specifically, you can use the brick'em scanner to identify each figure from a photo and confirm it matches what should be in this set. Missing pieces can be individually sourced on BrickLink.
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