sportsbooks
you might try the following that have good reps:
bodog.eu sportsinteraction.ca bwin.com
Depending on what sport they will have more promo material such as banners and wigets. There are also 2 main plans for affiliates. One is a kind of Pay per action for sign up-deposit action. So the people have to sign up -and deposit some money , then you get a cut. The second way is more of a straight up profit share. Each sportsbooker does it a little different.