Learn the best networks here: https://CoachingforInternetMarketers.com
This, I’m afraid, is a very niche-specific question, and it centers around what specific products and/or services you are looking to promote on your website.
Amazon is not the stop-all to end-all. Do they carry a wide array of products, they sure do, but like a convenience store, the prices are higher. I don’t mean that literally, I mean your commission as a marketer is lower for that convenience.