Ok... lots of people commented on my low ethics note...
I thought you meant grabbing the disk, copying the disk, writing down and keeping the serial, and then return the whole lot.
If all you need is the disk, then yea, download or barrow from friend.
Sorry for the confusion, I guess I didn't word it very well, But I assumed that when peterhuang913 said to get from store, to take everything.
http://www.techist.com/forums/members/peterhuang913/
Also, to Makaveli213, and the other who commented about Microsoft getting money. Note that I did say that Microsoft doesn't need the money.
Also, I did not know that the retailers don't have to pay for the software up front. for wal-mart, well screw them anyway, but I try to support the technology stores. (staples, best buy, local computer shops, etc.)