It should be a pretty generic part. Pull one at a junkyard or modify one from another vehicle. Car-part.com is my favorite junkyard parts searcher.

I think the stealer wanted $350 for a heater fan motor, but you can get them at Autozone for $25. It's just a fan, so it shouldn't be a problem to replace cheaply. Measure the dimensions and get one that's the same size or take yours into an auto parts store. I'm sure you can get something new or refurbed very cheaply.