I have a Fire 7 circa 2015 that is used 90% of the time to read mobi/azw3/ebub books. I works fine but as I mention elsewhere, the USB port has a bad connection that requires the cable to held at an angle in order for it to connect with anything. I do occasionally used it for webbing and reading email. If I trade it in on a new Fire Kindle, amazon will give $5 trade + 20% off. Any thoughts on a replacement?