Dyson's Delves I
Labyrinth Lord & Advanced Edition Companion
People of the Pit
Death Frost Doom 2e
Lesserton and Mor
Magical Theorems and Dark Pacts
River Knife Trilogy
This is an excellent chance for you sample the best the OSR has to offer. I haven't read the River Knife Trilogy or People of the Pit but the rest is excellent. Go!