There appears to be a retailer who is getting sporadic restocks of Prismatic Evolutions products and that’s Target. Target keeps showing up as having Prismatic Evolutions products for at least a little bit after the vendor stocks the shelves.
So go try your local Target!
Of course you won’t know when a vendor has come or no so this is down to luck… but hey, if you’ve got an extra 20 minutes why not.
Walmart has also been showing up as having some Prismatic Evolutions but it doesn’t seem to be as frequent as Target. So I’d definitely try Target first. I believe GameStop is basically out for now just so you know.