Free: Contests & Raffles.
I've sold three batches of guns with https://lsbauctions.com/ over the last couple of years. They pick up the guns at your house, auction them via gunbroker.com (https://www.gunbroker.com/all/search?includesellers=6089078), then send you a check for 70% of the total about 30 days later. Auctions run two weeks with no re-listing. You get a paper trail plus you don't have to deal with tire kickers, taking pictures, monitoring ads, haggling, shipping, flaky buyers, etc. Okie John