Do yourself a favor and check out Tommy Oshima's photos on Flickr. He's shooting primarily film, and he has a fair number of incredible pictures taken with a Super Ricohflex TLR medium format camera. These pictures, particularly, seem to indicate an affordable way into medium format film. Cameras in decent working shape can be had for well under a hundred clams, and maybe even under fifty...
Some of my favorite shots from Tommy include "ripplet" and "...Zarathustra"
Some of my favorite shots from Tommy include "ripplet" and "...Zarathustra"