The other option would be to use a service like VigLink or SkimLinks, depending on where you are located. They take a 30% cut, but all their commissions are already in the highest tier for Amazon, so you end up making more overall, unless you were already a longtime Amazon affiliate. They are not perfect (I like the Amazon reporting system more), but they are dead easy to use, and they convert links automatically.
Affiliate link is http://www.viglink.com/?vgref=15868, or just go to http://www.viglink.com.