Check out the DIY forum at www.HV20.com. There are some relatively inexpensive DOF setups described, that individuals will build for you. I would suggest that you get a vibrating model, even though it would be more expensive. Else, you will end up with some nice videos of dust particles.
This guy is just South of me. Pretty good little adapter for under $600.
Then aside from the less expensive DIY models, there was short film going around online a few years back where they mounted a Canon GL1 pointing down to the viewfinder of a medium format camera and shot that way. Really cumbersome but the end result was outstanding for SD and at the time, the M2 adapter was just barely coming out.