The Mermaid Castle (5960-1) is a LEGO Belville set from 2005. There isn't enough recent sales data for a reliable price estimate. It includes 3 minifigures.
This set includes 3 minifigures: Belville Female, Adult Woman (Mermaid) - Medium Green Swimsuit with Bubbles and Seashells Pattern, Dark Orange Hair, Fish Tail, Crown ($21.40), Belville Female, Child Girl (Mermaid) - Bright Pink Swimsuit with Bubbles and Seashell Pattern, Light Yellow Hair, Fish Tail, Crown ($18.64), Belville Male, Adult Man (Merman) - Bright Light Blue Top with Net, Starfish / Sea Star, and Seashell Pattern, Reddish Brown Hair, Fish Tail, Crown ($16.99). The minifigures have a combined BrickLink value of $57.03. Each figure is linked above with individual pricing if you're looking to buy or sell specific characters.
Yes, The Mermaid Castle was released in 2005 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 3 minifigures. 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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