Buying games from Steam in foreign store?
Solution 1:
A Steam discussion here suggests that buying yourself from other countries isn't allowed and could get your account closed.
What you can do is get someone from another country to gift you the game and they'll only have to pay the amount for their country. Steam has nothing against international gifting.
The Steam Subscriber Agreement states the following:
You agree that you will not use IP proxying or other methods to disguise the place of your residence, whether to circumvent geographical restrictions on game content, to purchase at pricing not applicable to your geography, or for any other purpose. If you do this, we may terminate your access to your Account.