Amazingly enough, at least at this, Gamma World 1e has made the top 10 titles on sale list. Other notable stuff includes Beyond the Wall, BRW Games, CoachK, Creation's Edge, John Stater, and probably more.
RPGA News Volume 2 #1 - Has to be from the early 80s. 16 pages, 99 cents
Polyhedron Volume 2 #5 - I think this was the new name for above. 16 pages, 99 cents.
FP1: Arrival at Fort Perilous - First adventure from Grey Goblin Games, sandboxy sounding adventure for B/X and LL. $2.20 and 30 pages
Midderzine Issue 2 - I always want to read that settings name as Middenlands, which would be full of otyughs. $3.84, 24 pages.