Maybe this is a "Show HN" item, but I created http://www.shippingfiller.com to scratch my own itch of finding filler items to meet Amazon's free shipping minimum with items I might actually want. And I'm too cheap to buy prime.
You are not too cheap to buy Prime, you just don't purchase enough from Amazon to make Prime worth it. A "cheap" person who uses Amazon a lot always has Prime, otherwise they are just throwing away money on shipping.
Once you start buying many items from Amazon, Prime easily pays for itself at the current level. And will pay for itself at the next level too after a certain use
