I usually have horrible luck hunting for used leftist works at the local book store, but today I found:
Black Skin, White Masks by Fanon
Guerilla Warfare by Che Guevara
Women in (Canada lmao) Cuba: 20 years later by Margaret Randall
Ready for Revolution by Kwame Ture
The Telling by LeGuin
Independent. It's a pretty big place, but they rarely have leftist stuff. In the past year they've started buying New stuff to fill their gaps in Black History and whatnot, but it's not really worth it New when I can get it online for much cheaper.