Verso Books is the largest independent, radical publishing house in the English-speaking world, publishing one hundred books a year.  They frequently give out free books, have regular sales and a monthly Book Club service offering all newly released books for a subscription fee.

Clear through the piles of unread Verso books mounting up in your library and learn more about the world!

Edit: This was originally a 2024 challenge but I've extended it out for another year, let's do this!