Greg (plays krieger) made my suit of black and green battle armor and Matt (Seattle plot) made the leather strap piece mail I was wearing friday of the last Seattle Event. Both of these suits were custom made and both of them were very time consuming, so I don't imagine either would be cheap. But both individuals have a knack for the art of armor making. Also, like JP already mentioned, GIdeon does awesome leather work and Jesse made his suit of chain mail. If on the hand you are trying to go fairly inexpensive I suspect any of these folks would let you pick their brain on a simple place to start and then you could hit up a leather store and make a simple suit yourself.
Holly