Yes, I'm very sure of that, cuz it's happened to me on several occasions this year.
No pre-orders? Maybe 1 will copy will come in to have on display (did happen, and I bought it). Maybe 2 copies if a clerk planned on buying the title as well (did happen). Maybe a nearby store will stock 2 copies while this store didn't, making the average 1 copy per store (did happen).
What GameStop really wants are 1) People trading-in games, 2) selling the used games. <-- this makes them more money than selling new stock.