Look into craigslist.. lots of good deals on craigslist..
If you don't know a lot about skis, ask a local mechanic to check it out for you or tell the guy you want to test drive it on the water. But I doubt you'll find one at a dealer.
I have a 96 Yamaha 1100 with like 150ish hours on it.. and I only paid 1250 (and I got the huge trailer to go with it) but I got a stellar deal.. the guy just wanted to get rid of it I think.
But look into ebay and craigslist.. Good Luck!