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I've had pretty good luck with the Uniden and Cobra base model CB's, I think I have a Cobra 29XL. They usually run about $50 and can be purchased almost anyplace that sells electronics. Just make sure you get a good antenna. You will do better with a cheap radio and a good antenna than with an expensive radio and a cheap antenna.
I've seen a number of them in thrift stores such as Goodwill, Salvation Army, etc. I bought my 40 Ch. Panasonic in perfect condition complete with original box, manual, mounting bracket and screws for $10 at Goodwill. Bought a 40 Ch. GE at a yard sale for $2.50 but I never have hooked it up to see if it works. Bought a couple of nice antennas on ebay where you can find just about anything you could want in CB.
I know my dad has a bunch laying around in the garage. He always had them in his trucks. I know he has some kickin antennas also. I may find one and put it in my truck one of these days....