Welcome mothra ! Unfortunately the Russian choice for 35mm is not a real option here, as the Jupiter-12 (35mm f2.8) has a really huge rear element that would block the internal meter and may even damage the shutter blinds on your Bessa.
Another options are Canon (Serenar) and Nikkor LTM lenses. Their slower 35mm lenses (f3.5) may be found in your price range. These lenses can be found more or less easily in some well known online stores (KEH, B&W, Ritzcam, etc) or also on the classifieds section of some other forums (photo.net, for example).
On Russian glass, I've just ordered a 35mm Jupiter-12 for my Kievs from Oleg Khalyavin, on
www.okvintagecamera.com. It's my first purchase from there but you'll read a lot of good comments about him and his products and services, so it may be a good place to begin your search.
eBay is eBay, you know, you can get the deal of your life there, and also you worst one... alex-photo has good reputation, I've also had luck with holms and dzerjinski.
Good luck !
Oscar