Find a small used book store. Odds are very good that they discard quite a few books in any given week, not necessarily because they are garbage, but because they just haven’t sold, or they have too many copies, or they might have comparatively minor condition issues that preclude them from selling in the store. They may give them to you, or sell them to you at a steep discount.
First of all, good on you
Would your local independent/radical bookshop be willing to help with some donations or discounts?
Or are ebooks an option? I think verso or other might have options but the may be blocked by fascist prison state
Find a small used book store. Odds are very good that they discard quite a few books in any given week, not necessarily because they are garbage, but because they just haven’t sold, or they have too many copies, or they might have comparatively minor condition issues that preclude them from selling in the store. They may give them to you, or sell them to you at a steep discount.