Pre-Order Windows 7 Home Premium Upgrade: $49.99

The most reliable PCs in our house run Windows XP SP-3. We skipped Vista, but at this price, I think I'll upgrade a couple of them to Windows 7.
Update - the Windows 7 Upgrade Advisor ran for hours before I canceled it - maybe I'll pass on Win-7 until I get a new system after all.

Note that this price is only good until 11 July, 2009.

Windows 7 Home Premium Pre-Order, $49.99 Upgrade, $199.99 Full | PCMech:
" . . . if you pre-order Windows 7 as an upgrade, the Home Premium Edition (which is what most people would go for) is just a tick under $50."