Used skid steer loaders are in abundance and easy to find. Good places to look are eBay and craigslist. If you choose to purchase from a skid steer dealer, you may even be able to get low percentage financing.
After hurricane Katrina and Rita in 2005, there were parking lots full of used skid steer loaders for sale. A simple search online should reveal a number of skid steers, including: Bobcat, Case, New Holland, Mustang, Caterpillar and John Deere.
Bobcat skid steer loader sizes: