Here are a few places you could start looking.
Just what kind of AK are you looking for?
And what kind of shooting are you going to be doing with your new AK?
The fit and finish is a little rough on the Romanians, while the Yugoslavian & Chinese AKs I think are top of the line.
The Bulgarian, Hungarian, & Polish fall some where in between.
If you are looking for accuracy & cheap ammo go with the AK 74s (5.45x39).
If you are wanting fun plinking and don't mind the recoil the AK47 (7.62x39) is good.
If you are wanting something a little different, a gun that really gets attention at the range & can reach out an touch someone or something, try the Dragunov or FPK/PSL (8mm or 7.62x54r).(ammo is cheap too)