Developer for VB/C# that is very experienced with Amazon Product Advertising API needed

I am looking for an experienced VB/C# developer who has already a lot of experience with the Amazon Product Advertising API. A small tool needs to be written quickly. Short Project description: The tool should be able to look up a list of EANs/Barcodes on Amazon, and return certain values (item Name, amount of new offerings, price of lowest new offering, amount of used offerings, price of lowest used offering) in a grid. It should be possible to paste the list of EANs into a text field in the application. I have such a tool already, but for some reason it is not working anymore. When the tool is created, i need to get the source code and all rights of the tool. Thank you.