I've found super Wal-Mart is a good place to get it. When you live in Hickville, there isn't a B&N...but Wal-Mart is open at midnight. GoF was like 13 dollars there, too. Only thing is they stare at you like a lunatic when you waltz in a half hour before midnight and ask where the display of HP books will be set up.
I hope this one lasts longer...I had GofF read within 24 hours.