B&H Photo has a used one for $749.
B&H gives you a 90 day warranty and a 15 return policy. If they say "email for condition," it usually means the lens is damn near flawless. Maybe a returned new lens. If you're patient, you may find one on Craigslist. I got mine off Craigslist for $550.
And if you're not too far from NYC, you may want to walk into B&H and ask about a used 10-22mm. When I got my used 85mm f1.8 there, they sold it to me for about $20 less than the advertised price.