Keep in mind, with Amazon, the commission rates are (mostly) between 4-8%. That's a measly $4-8 per every $100 worth of items moved. Not exactly riches.
The only way you're going to make decent money through Amazon is by promoting something you can sell in enormous bulk, or by promoting high-end products, at least in the hundreds, although preferably in the thousands.
That's the bad news.
The good news is, since Amazon sells nearly everything on God's green Earth, there's plenty to choose from: Jewelry, electronics, industrial equipment, collectables, etc.
Since the world, including the Internet, is full of rich assholes with money to burn, there's always a market, regardless of the price. Sure, I would never buy a $65,000 Hobart dish-washing machine, but there are people who would, will, and have.
Just make sure your site provides extra value beyond a generic bridge page linking to Amazon. Give both people and search engines a reason to prefer your site over competitors' sites.