Is there a way to buy a game that's unavailable in my region?

Probably.

Yes.

Plane tickets are cool. And you get free movies in the plane. And you get to kick other passengers at chess too.

amazon doesn't check if the address you entered is valid or not, and no proxy required - for example.

Any other site - same, but may need proxy at the time.

Buying game gift from other traders via keys can also be a solution. However, i do not know if activate a gift in restricted region is possible or not.

Try and trade for it, but you need to make sure that the trader doesn't give you a region restricted copy, or you could buy it on a site like Amazon or GMG that sells games that activate on Steam.

Yes but it's unsafe.I'd not recommend searching for it, you might not like what you find.

IIRC, the Metal Gear game on Steam can't be traded across regions, so you might not be able to get it on Steam unless the publisher makes it available to your region.

You can get it but only with ROW keys, from sites like Amazon or GetGamesGo