Cheapest way to get a Windows 7 product/activation key?

run out of the store with one

on one of my laptops, the frikkin number rubbed off

I never wrote it down....I now put clear tape over the key code on the bottom

and on another one, I just tolerate the message that I need to activate, it slows down the reboot process, but hardly gets in the way

ever hear of a [ windows loader ] ? do a search...sometimes they work

See if this helps. I have used this in the past.

Get a jelly bean