http://iowacity.craigslist.org/bfs/2728380281.html
20# tank and regulator for $75, It looks like only a single gauge reg, but for someone wanting to start kegging, it may be worth a look. It doesn't say when it was hydro'd so you may want to check that out too.
CO2 tank on Craigslist
CO2 tank on Craigslist
Bad people drink bad beer. You don't usually see an empty bottle of Rochefort tossed onto the side of the road