We recently re-did our entire online presence, as well as the back-end logistics of our company. We were already selling our products on Amazon, but instead of having a checkout process on our website, we are now sending all customers on our website to Amazon to make their purchase. Here's the problem-- Amazon does not have a visitor tracking feature. There is no way for me to tell where the Amazon visitors come from. Technically, I can use Google Analytics to tell how many visitors went from my site to my Amazon page, but from there, I cannot tell if the sales are coming from visitors from my paid advertising, or just through organic Amazon searches. I do sort of have a baseline for where my organic Amazon sales are, so I guess I could do a LOT of calculations and research from a number of different data sources (the data I can collect from Amazon, Google Analytics, Google Adwords, etc), but I'm really looking for some way to consolidate the way I track my ad campaigns. Even if I took the time to deduce where my sales are coming from, I would only be able to do one campaign at a time, and test it to my baseline sales-- but I want to run multiple ads right now. Any ideas?