Free: Contests & Raffles.
Look for a used Honda Rancher. They will go anywhere and haul anything out. I own 3 and have never had a thing go wrong with any. I'd shop around for a used one. Should be able to pick one up up in great shape for less than $3K. Can-Am, Yamaha, and Suzuki are also good bets. I'd stay away from Arctic Cat and Polaris. They make some of the best sleds, but also make the most problemsome, tippy ATVs out there.