The online community of knife collectors, A Knife Family Forged in Steel
have bought knives from friends, family, co-workers,swap meets, flea markets,knife shows, gun shows..local knife dealers
I buy most at flea markets. Then there is ebay. I trade for a few at work. Lot of knife guys there. We head up to Shepard of the hills cutlery about 2 or 3 times a year.
I think I like the flea markets the best. Its all in the hunt.
When I'm working I buy wherever I find what I'm looking for at a competitive price. Lately though I use estate and garage sales to find some neat bargains. eBay has also yielded some good deals. Sometimes you score big if someone is sleeping at the bidding switch or you learn how to be a good sniper.
I have had the most success at sporting good stores, mega marts and the local flea market. Marginal success at pawnshops and the antique malls. Bought two through Amazon and was happy with service both times.