Firey is always the priciest little monster - he can run right up to the $35 mark. Smokey and Prickles $25 at the moment.
If you are buying...check out ebay UK some of the sales for Princess dragons on there recently have been woefully low. In fact dragon prices are just down in general. If you are selling can you let me know if here or ebay for auction, as I am after a Prickles upgrade!