CedCommerce Amazon Channel

I highly recommend this company. Ive used their applications for my etsy, wal mart, and amazon integration. First of all, its an easy to use and effective application. It has everything you need to connect your shopify store.
The main reason why i recommend these guys is their customer support. They go above and beyond to take acre of any questions. They take the time to show you all the features and how to use the app efficiently. They are always available if a question arises