Yeah, if its anything like around where I am, you can get an old fridge for free. Consider that it sounds like you'll have to replace all the lines (although I probably would anyways - cost about $10), basically what you are buying is a used faucet/shank, CO2 tank and regulator, and sanky connector (which are nice to have around, but if you're just using for cornies right now not really a lot of use to you). I didn't see a picture of the CO2 tank, so I'm not sure how big they're talking about.
Looking at Kegconnection, a new set would run you about $150 (minus the keg and obviously the fridge). If its hard to stumble across free fridges and don't want to have to worry about drilling through them (real easy on the door, harder on the side like they show), $100-125 would be about right. If you can find a free fridge fairly easy and don't mind a little DIY, you could make yourself a nice one (perlick faucets, new co2 tank, etc) for $175 or so.