An Android tablet and the CoolReader app. For me, it's simply the best eReader experience available. It's incredibly customisable. The only downside is it doesn't support PDF or AZW3, both of which can be reformatted to your preferred file type with Calibre anyway. Source: over 1 year ago

Cool reader is also another option https://sourceforge.net/projects/crengine/. Source: about 3 years ago

eBay, you can also try bigwords.com which checks multiple buyback sites for the highest selling price. Source: 12 months ago

When I was in school, I used bigwords.com to buy any physical copy of a textbook I needed. It's a comparison shopper, and checks the difference between buying and renting at several stores. Source: over 1 year ago

Echoing that you'll probably get very little or no money from them, but my recommendation is to try bigwords.com. You can load all of your books into your cart, click 'sell' instead of buy, and they'll aggregate the best websites to buy them back (considering combined shipping, etc). Source: almost 2 years ago

Amazon has a lot of good used book listings, there's also bigwords.com to find used books (since you mentioned you don't like reading books on screens ...which is also awesome!). Source: about 2 years ago