What do you think about Amazon affiliate?
Have anyone tried it?
Is it paying good per referal?

Yes, I have used Amazon in the past and it was fine. You just need to have the right type of website to get clicks. If you have a random niche, then it will be hard to sell items from them. Most people go to websites to find information, rather than to buy a product. Sports teams pages, celebrity pages, and other types of websites are great fits for Amazon affiliates.

The payout rate is pretty good. I have heard of a guy who gets just over $100 on some clicks because people were buying bigger items. Also, as you get more referrals, your rate goes up a percentage point. I'm not sure how many sales you need to bring in, but I know this is the case.

I recommend you try it out. =)