Backup or main??

Hello and welcome everyone!

I love books and I love sharing :)

I was once the mod of Reddit's biggest textbook sharing sub called /r/textbook but reddit banned me cause I shared so many textbooks for free!

Now I upload them mostly on libgen!

BUT there should also be a place where people can buy/sell their old textbooks or get free or really cheap PDF textbooks (or epub or whatever)

Please share sites like Anna, Libgen or others!

Also share textbooks! Ideally FREE :)