couldn't say, but it's not likely. here's why:
*most* of the merchandise sold on property is theme park merchandise. it usually has a gold castle logo on the packaging/tag and has '
disneyland' and 'walt disney world' on it
all of this merchandise is exclusive to the disneyland and walt disney world resort (and
disneystore.com).
even if you see a mickey mouse doll in the parks, it's not likely to be the same exact one you'd see at
disney store. in fact, disney store has its own distinct line of exclusive products.
there are a few places you may be likely to find non-theme park merchandise, most notably at once upon a toy, but the vast majority of this merchandise is manufactured by Hasbro (who has licenses with Disney, Marvel and Star Wars, amongst others).
Dance Star Mickey is from Fisher-Price which is a subsidiary of Mattel. So it's really not likely you'll find him on site. although it is possible.
That said, he is EXTREMELY popular and many etailers (and even retail stores) have sold out of initial shipments and are already selling him on backorder.
so if anything, I'd just order him from amazon.com or disneystore.com and if you're lucky, you'll have him by early november.