I've not had ANY luck with distributors, breweries, etc. And scrapyards are forbidden by state law to possess kegs due to the glut of people selling them for more than their deposit a few years back.
I actually got mine from guys on here. CL is also a viable option, though there are usually a few guys trolling for them already.
That's not to say you won't have different luck, but they can be difficult to scare up.