I've bought a couple of pre-owned bags. I always get them authenticated on the forums here, check them out thoroughly, and only buy from reputable sellers, be they ebay or a consignment store that specializes in designer bags. I agree that if I can save a substantial amount for an authentic bag or get something that's discontinued (e.g., the Balenciaga Purse style), it's totally worth it. I agree that it's not worth the risk for a couple hundred dollars on a bag that's still available new, though.