HUMAN
Hello,
I am not sure if you already have an application at hand developed in .NET.
If you are starting from scratch and willing to accept other languages, I have already gone through a desktop application that links Amazon with Ebay, in Java. I imagine your requirements will be different from the one I have, but I have already set up the code to deal with both Amazon and Ebay in Java, using their Java SDKs (Amazon Advertising SDK, Ebay Finding Kit, and Ebay Trading API). The local database solution was in MS Access, because the client was in a hurry. We can work with any database you like.
The advantage I am offering is the relatively quick development time (and some cuts in price as well), saving you at least three weeks of development if not more. I know this means you can start selling faster.
I generally do this part time @10 to 20 hours a week. The hourly rate varies from $15-$25 depending on the nature of the job and the size of the project.
If interested, please message me with any questions you might have or more details to make you a more accurate proposal.
Best,
Yara