Add a small amount of white space immediately below the results table. This will create a clear visual indicator when you've reached the end of the search results. Right now, every time I scroll to the end, my screen stops moving and I momentarily think my touchpad is no longer responding.
Turn the item names into hyperlinks to search for the string on Elanthipedia.
In addition to tracking Last Updated Time, track the first time each item was seen at a particular shop. This might involve some annoying changes to the way you're handling the back end data, but that's why this is a wish list. Allow search functionality / filtering to return only those items added within X time.
Now for my wishlist: