Thanks for taking the time to review my proposal. I have what you need built already for my own personal use, and have customized hundreds of times for many different clients.
This is a web based tool that I will customize to search by ASIN and retrieve trade in price per your requirements, I will provide you with the URL to use and run program. You will upload a .csv file containing the information you want searched in Amazon. Once uploaded, you will receive confirmation that upload is complete and be able to begin the search process. the application will then search amazon for trade in prices by your supplied ASIN list. When the job is done running, you will be able to download a .csv file , first column being ASIN, second number being trade in price. I can host this on my server for no additional charge for you, or upload to your server if you prefer.
Although I am relatively new to freelancer, I have completed a handful of jobs on here. I have been working some freelance work on other sites and have been doing professional web design and programming since 1999. I'm definitely not new to this, and will get the job done for you.
Sincerely,
Kevin Cassimore
Laurel, DE USA