I addition to what the others have offered let me suggest Antique stores (these are the best for me), Pawn shops (for silver strikes), flea markets, garage sales (slim pickins), coin shows, gun shows, friends and relatives, co-workers, and many more places. I ran an ad in the major paper here in Phoenix and found an ex casino dealer who needed money real fast and sold me what he had at face value that books for a whole lot more. The next time I advertise I got nothing. I currently have an ad in a Sun City, AZ (Large retirement community) newspaper and have received zero calls. I guess what I am saying if you never know where you will find things. You keep looking.