The big glut of CUCVs on GL is over now, most have been auctioned off, but they do still show up. They don't go for $500 for one you can drive home anymore either, because there are few of them coming out now, and more folks bidding on each one.
As mentioned above, if you buy one on the civilian market, likely as not the owner has had to fix some issues, major or minor depending on his luck, but at the very least new tires. He will expect to get a return on some of that.
Expect transmission or driveshaft problems, if the owner hasn't already fixed those. GL loved to pick those CUCV's up with large forklifts, and damaged the trannys and driveshafts on a huge number of them.
The good thing is that there are a lot of them out there. Some folks do think theirs has gold bricks in it, but be patient, and do a lot of looking, you will likely eventually find one in your price range.
Cheers