wheres the best/most legit place to buy them, looking for a few.

and i heard you can run multiple diablo's with the same classic key? true or false

I've never heard of classic keys working different than LOD keys.. should be one cd key per instance of the game..

That being said im also interested in finding a cheap cd key

battle.net only to purchase
and false, you are not allowed to talk about 3rd party programs here.