There are a few other popular cashback sites for Amazon shoppers besides Ebates, including TopCashback, Ibotta, and Swagbucks. All of these sites work similarly to Ebates, giving you a percentage of your purchase back in the form of cashback.
Although Ebates is the most popular cashback site for Amazon, that doesn't necessarily mean it's the best. Personally, I prefer using TopCashback because they tend to have a higher cashback percentage for Amazon (and other retailers) than Ebates. I also like that they have a "Pay with PayPal" option, which makes it easy to get your cashback without having to wait for a check to come in the mail.
If you're looking for more ways to save on Amazon, I would also recommend checking out Ibotta and Swagbucks. Ibotta is a cashback and coupons app that you can use for both online and in-store shopping, and Swagbucks is a site that offers cashback for a variety of different online activities, including shopping, searching the web, taking surveys, and watching videos.