I Agree with Grumpy, personally I would make a quick trip to the local tip shop, and scout out ebay for a few minutes, Just to see if I could maybe find a cheap unit for parts, but otherwise it's probably not really worth it.
You could try to contact the manufacturer to find out the cost of replacing the part, but I can't imagine the cost being too friendly.
If you really want to fix it up, pop it aside for now, and keep an eye on the tip shops and Ebay, as well as posting a request in the wanted section, with as much detail as you can about the specific part, one of our members might well be able to help you out.
If you plan to keep the machine while looking for the part, let me know, I can't promise anything, but I am happy to scout out the tip shops here and see if anything turns up for you.
