I found some rather inexpensive Windows 8.1 keys on Ebay for about $30, but I have no idea how to tell if they are legitimate or not?http://www.ebay.com/itm/Windows-8-1-pro-Professional-Genuine-License-Key-32-64bit-Digital-Delivery-/262287975261?hash=item3d1194e35d:g:DbsAAOSwUuFWvkkr
If it\’s on eBay for $30 it\’s not legit. End of story. It cost $80-$100 minimum. Buy it from an actual retailer like Amazon or newegg or you will get a fake.