It is a hell of a lot, assuming that isn't one of the busiest stores in the company. I worked at Gamestop through the PS1, N64, Dreamcast, Ps2, Xbox, Gamecube launches back in the day. I had a dozen or so stores in my district(in a metropolitan area) and even my #1 volume store had maybe 30 PS2s at launch, the slower ones more like 10. Xbox was about the same, maybe slightly more. I think out of all of those, we had a bigger allocation of Dreamcasts than anything. I definitely remember having 50-60 Dreamcasts at launch per store on average(Segas problem was peripherals. The VMUs and extra controllers were in super short supply). Gamestop has grown a lot since I left the company in 2004, they probably have over twice as many store locations now. So we can probably assume that with twice the # of stores, and that much allocation(assuming that is an "average" store) that there are probably 4-8x as many systems available for launch for the PS4 as there ever was for the launch of any system in the PS1 - PS2 era.