Thanks for the replies. It does make more sense to buy it from a retailer, but money is a little tight and would perfer to spend as less as possible. I'll keep checking craigslist and hope to score a deal.

Hello Everyone, I am in the market to purchase a new cpap machine. I am interested in a Resmed S9 Autoset and want to buy it new or used on craigslist in order to save some money. I am located in Los Angeles and have not seen many being sold on there. There is one on sale now w/ humidifier for $750 ...