Leading Edge Cash: they've been around for years. Constantly add new products (Vigrx, Magnarx, vprx, semenax, vigorelle,...). Lots of promo material including sample sites and articles. Paypal or check payouts. Recommended. (The same guys that run Electrabucks and Natures Drug Store)
JoeBucks: Also good. Paypal payout option.
OAInternet: Doesn't convert as well the other 2 but they give a $99 signup bonus.