On sale today at Newegg .. Windows 7 Home Premium 64 bit (you don't need the next version up unless you're connecting to a business domain) for $80.
http://promotions.newegg.com/NEemai...XPRESS060912-_-EMC-060912-Index-_-E0-_-SeeAll
http://promotions.newegg.com/NEemai...XPRESS060912-_-EMC-060912-Index-_-E0-_-SeeAll
