Used SS Question

Within the next month or so, after I sell some paintball and airgun stuff, I hope to have enough money to buy a Talon SS. I am hoping to have around $500 to burn, which I know is plenty to pick up a new one. However, I am thinking I would like a pump as well, which means I would probably be looking at a used gun/pump combo. What would be a fair price to expect to find a gun and pump in used but decent condition?
Thanks in advance,
Chris