The Queen of Hearts and the rest of the Wonderland gang were the first releases at the US Disney Store after Tsum Tsums made their debut. They have since sold out in the US and haven't been restocked; however, if you are extremely lucky, you may be able to find them in some stores. They also have been released in Japan and have been around for awhile but they seem to be a set they keep restocking. She is currently sold out on-line but may still be in some stores (and may come back in-stock elsewhere).