If you want to sell your knives, I mean "everything must go!" sell them, nothing beats eBay. List it without a reserve and it will sell. If you absolutely must get "x dollars" to part with a knife, you are as likely as not to see them sit for quite a while with either a reserve price on eBay, or with a fair to you price here on the forums. If you have a rare or sought-after variant you might get a really good return on eBay. You'll likely see your knife sell quickly here as well- given you are willing to sell at cost or less. Just remember that the for sale forum is not an auction- you must list a price. You are unlikely to see a bidding war, and equally unlikely to get an offer above your asking price. But, you will likely get more low ball offers than "I'll take it!"