A lot of camera stores are stuck with film bodies that they can't get rid of. I'd go to the biggest local camera store and see if you could rent a camera and a lens (or two) for the duration of the course; or maybe even borrow it -- tell them that you'll buy your next 20D lens from them. Alternatively, if you have the cash to buy a new lens now, tell them that you'll buy the lens if they'll throw in the loan of a film body. I'll bet you could work out a deal...
I've taken a couple of courses with the Sante Fe workshops, where we shot film, and film has one advantage over digital for these situations -- it projects better, unless I'm dong something wrong witih my digital projector (I'm not real experienced with it.) I find it frustrating to know that you have a great shot, but you're essentially enlarging a limited-resolution TV screen to 20 times its normal size, and the details of the shot, the pixels, come out looking like softballs.
JC