In the last month, I have been successfully dropshipping items from Amazon to eBay, using the Amazon Prime to sell on eBay method. This has worked for me with pretty good success. I have run into the same issues that everyone always runs into: items go out of stock or the Amazon prices change and I am either forced to cancel the sale or sell at a loss. This has led to a few negative feedback responses. Now, I have moderate programming experience and figured I could come up with a program that would (at a high level) "track" an individual item on Amazon that will alert me if an item changes in price (out of my range for profit) or it goes out of stock. Through my research, I have some questions that I am having trouble figuring this out: 1. Am I simply re-inventing the wheel here with creating my own program? Is something out there that already does this and more for me (preferably free!)? 2. This is not possible without purchasing one of the Amazon accounts that gives you access to it's MWS API. Is this true or have I missed something? Any suggestions or comments are welcome. Thanks!