Thanks, Mach2.
Have been keeping an eye out mostly on craigslist and eBay.
Craigslist usually has complete (or near complete) machines, so nobody is willing to part with a compound.
Compounds come up on eBay every few weeks, but thought I'd try here in the meantime. Also, eBay prices are usually a rip off.
I do have a "backing off" / "relieving" compound equipped on there now. Locked the gibs down so it doesn't slide on me. So I'm not totally high-and-dry, so to speak, but a compound in the near future is a must-have.