Hi!
I'm an experienced software architect who has worked a substantial amount of time in the logistics business, including integrating UPC handheld code readers with web-enabled applications.
I would propose a system that is a completely standalone desktop application, fetching all the necessary contents from Amazon, and populating the CSV.
With over 10 years in Qt/C++ development, and over 5 years of experience with Amazon, I can easily deliver this within time and budget (or, likely, significantly ahead of time).
Best Regards,
Tomasz