A possible way to pay with dollars instead of euros [STEAM]
1. Get firefox 3.0 (the addon doesn't work with 3.0+)
2. Install
https://addons.mozilla.org/en-US/firefox/addon/5948
3. Open up Tools -> X-Forwarded-For Spoofer and enter an US IP, ex: 66.167.100.59 (the program spoofs that it is 66.167.100.59, it doesn't use it as proxy!)
4. Go to
http://store.steampowered.com and login with your account
5. Add games and pay!