a site i discovered a few months ago is dealmac. i check it almost every day, don’t buy anything – since i do not have any expendable income, but look.
if you are thinking of buying anything technical (from a 50″ HDTV to a 1gb flash drive) i would check here. i have seen really inexpensive flash drives (sometimes less than $10), 500gb drives that are $20-50 less than if you found a “good price” at cdwg or newegg.
a little research will go a long way.