Pretty sure this was supposed to be a San Diego Comic Con exclusive. 77907 Toad’s Special Hideaway Expansion Set is a limited edition set and is now available from Target and LEGO.com. The asking price is $19.99 no matter which vendor you choose. You DON’T need to be a REDCard holder to get it but it does net you free shipping and a slight discount. Target restricts purchases to 1 per order. LEGO.com has it too with a limit of 3 per order.