I signed up one of my web sites with more reasonable prices than any other web site I saw on linkworth. That was October 17th and I haven't heard anything. Once you sign up they give you an affiliate number. Hopefully I won't get banned for linking to mine:
http://www.buy-links.com/archives/000724.html
Anyway, it's free and easy to sign up, but you probably won't get much business (presuming your selling links). If you want to buy, most webmasters seem to be asking quite a bit of money. I didn't see any bargains.