The original 12 Fairy Tails birds seem to run $6-10, with Taffeta Tails probably being toward the middle (Twilight, Tulip, Tippy, and Tasty Tails seem to be more in-demand and may go for a little more, although it depends on condition and who is looking). You'll see them priced for more on ebay and they might go for more in nice condition if someone is really looking, but most higher-priced ones don't seem to move, if that makes sense, unless they have accessories with them.
Not sure on the Curly-Q Boutique. Maybe $10 if the parts and stickers inside aren't stripped out? It's hard to sell playsets because of the additional shipping cost, of course. I might be interested, depending on what the inside looks like if you are selling.