AR-15 Worth

I was wondering if anyone could help me out. How much should I expect to pay for this rifle? Pre-ban Colt AR-15 SP-1 model (telescoping stock, 16" barrel) with factory Colt 4x scope. Excelent condition, 200-300 rds fired, virtually no internal or external wear, has manual and original 20 rd mag. PLeae respond via email, as internet here is unreliable at best. Thank you.