I just purchased a 3520b used 5 years old and paid $2650. I also got the 18" extension bed, an index wheel and a dsut collector hood and stand for that price. I paid another $250 and got 3 chucks, extra jaws and some face plates. I felt pretty good about the price. It wasn't clean by any means but no rust on the bed so I think for a 5 year old lathe it was a fair price. They rarely come up for sale in my area so when this one came up I bought it. I figure if I don't mess it up I could probably sell it for what I paid in a few years.
Here is a picture of it.
lathe.jpg