Please- in spite of the fact that they may appear legitimate, there is no such thing as a legal site selling OEM software with no boxes and all that in spite of all the SPAM email you get regarding "cheap OEM software" and such.
Take a minute or two and look at any of the links in the
OEM Software Scams search provided by Google.
Or just go ahead and give them your money (they really appreciate it if you pay via credit card and most make you agree to not do a chargeback at risk of being sued by
them if you do

.... hmmmm....) so you can get pirated software on a burned disk with a keygenned registration code, or worse nothing at all and just leaving your credit card info in their hands.