Microsoft sets a 'recommended retail value' price tag on each edition, so most stores will offer it at the same price. Only a few will offer it cheaper, in hopes that it will attract more customers to offset their loss. When the prices look too good to be true, they probably are; there's always a long list of websites selling fake and/or pirated copies of software. Stick with someone reputable (Amazon, Newegg, TigerDirect, et cetera) and know what you're getting, even if it is a few bucks more than 'SuperCheapSoftwarez - Buy from me!'
im searching a place that i can pre-order windows 7, till now my best result is:
i must say that i really like amazon but maybe someone found that in somewhere else cheaper?