Yeah, I live in Northern Calif. and have seen this add before. I left a voicemail, once, and never got a call back. He want's $10 more for ball-lock! I ended up getting a reconditioned, clean, ball-lock corny for $49 + 5 dollars shipping.
Keep in mind that I'm only 20 miles from William's Brewing. Their shipping rate averages $6 no matter if it is a keg or 1 oz. of hops. I bet it would be close to the same shipping rate for you to Pleasent Hill.
Anyway, this buy was totally worth it. The keg arrived better than pictured, seals good and keg clean.
I've bought a few kegs, in the past, from craigslist folks (averaging $40) and the quality is hit and miss.