I have picked up a large number of draw knives over the years at estate auctions. Sometime for as little as three dollars, but usually in the 6 to 8 dollar range; sometimes a bit more depending on what it is. I clean the steel up with fine emery cloth, clean the wood the best I can; and sometimes tighten the handles a bit if needed and if possible; then I sell them. I have sold a lot of draw knives on Ebay, quite possibly to folks here.
There are bargains to be had if you are patient and check out auctions, and also flea markets as some have stated.
Harold