I was considering recommending Certo6 as well. I have not purchased from him, but he has a good reputation. If you email him, he will send you a price list for a large number of cameras--you don't have to wait for things to be placed on eBay.
Originally Posted by Saganich
I had excellent luck with a Mockba 4 I got from Fedka.com. This is a variant of the russian copy of the Ikonta, with a Tessar-like lens. It is pretty good. Not as good as the 105mm Ektar (Heliar) on my mini-speed, but good.