I paid $500 for a decent one. $500-600 would be a good price for what you describe.
Stay away from the heavy ammo, stick with the light ball (148gr) Romanian stuff. Learn how the gas valve works, its probably backwards of how you think as is the safety. Set the valve all the way closed and then open one click then start shooting. If it doesn't cycle properly, open another click and repeat. Run it at the lowest possible setting that cycles reliably.