As stated already, you're options are Ebay and Amazon.
You have to write articles that really compel the reader to buy the product, which is hard. However, if you can achieve it, its a massive payout.
The best articles to do this would be Reviews, such as book reviews, tech reviews and movie/music reviews. These normally get a fair amount of traffic, and if you compare several products and provide links for every product, thats more of a chance you'll make a sale. I don't see why you wouldn't want Adsense on your account anyway though, I highly suggest it.