Hi, there! This project of yours seems really not hard to do, if i understand well, and it can be done quickly. I have made various chrome extensions to do various things (data scrapping, downloading, automatic sale listing, layout manipulation, some api connection, notification, form filling, making stats from web data, etc.), I am also an ebayer (i was also using my own ebay bidder and auction end notifier, when buying a lot...).
I am new here for today, looking for some small jobs like this, to keep me coding, give me a chance to make another chrome extension:-) Thank you and have a great day!