CECash offers weekly reward points in large amounts
at the CE radio shows on Monday, besides the reward points for the signups and mags, and you can buy almost anything legal you can suggest, even pay your IRS taxes
Internet Eraser has a car giveaway if you have 20 signups.
Pornstars official sites - 60% recurring offers an all-paid trip to LA to watch live a movie shooting of the pornstars you promote
Platinum Bucks and
Silvercash and
Gigacash also offer nice rewards such as cars
if you have enough points from signups.