Although I didn't receive a call from Gamestop about my pre-order, I went ahead and stopped by when doing errands today and said they had just got Shulk in. I'm a bit disappointed that the packaging on the ones I had the chance to look at were all damaged looking, but I'll just open the one I got anyway, I guess. I asked out of curiosity if there'd been any extras other than the ones for pre-orders, and as expected, they said they didn't get in any extras.
I decided to check out the Amiibo selection when picking up groceries at Meijer's after hearing some people have found wave 3 stuff there, and sure enough there were 2 Ikes, 2 Mega Mans, and 2 Dededes on the pegs, so I bought one of each of them. There were some empty pegs near them, but I'm not sure what might have been on them.