Bookmooch is fairly useless for cookbooks, I find. In fact it's fairly useless for most books, unless you are in the US. Postal costs have gone up so much that most people won't ship outside their own country now. I've been a member for several years, accumulated hundreds of points, and the last time I successfully mooched a book was last August :(
Abebooks, on the other hand, is wonderful. i've been able to find a lot of long out-of-print books there, some of them for pennies. But if your book is rare and sought after, expect to pay over the list price for it.