After running a couple of Google searches, I found the Amazon Customer Service Phone Number on a similarly titled blog.
(This information was previously available on another blog, Amazon.com Customer Service Phone Number, but it is most certainly not on Amazon's own website.)
If you find yourself in a situation needing to contact Amazon, as have I, please feel free to try looking on these two links. I promise to report which phone number works.
My issue has to do with technical problems that obstruct sales on Amazon sales plages. My main issue is: why doesn't the "Add to Shopping List" button work for third party listed items on Amazon? If part of Amazon's recent success is coming from "its fast-growing (and high margin) merchant market, which allows merchants to sell goods alongside Amazon," why isn't the full functionality of the website's features available to third party sellers?