Ditto on Sheldon's site. And Park's Blue Book can come in handy. Of course, it is filled with hints to buy their tools.
Searching craigslist free section for any yard sale leftovers can yield a few cadavers to dissect, without any fear of flushing money. Plus, you'll end up with a few good pieces for your spare parts bin, and even if the frame is rusted and cheap, the local recycling shop will still take it.