I sell online mba certification courses for 50 $ . We have professors of very high credentials teaching online so our profit margins are 20 $. I will be able to give you 10 $ per sale and a 5 $ discount coupon to track that the sale came from you. My profit per sale comes to 5 $ while you profit 10 $ We do have a free course so that the person can try it before he buys it. Let me know if anyone here is interested in it via PM and I will give you the website name.