I already have the motherload of 512s and just picked up a couple hundred 27C040s...
How many do you have? What package style are they - EPROM (with window), PROM (plastic body & no window), DIP packaging, or PLCC (square with folded under leads on all 4 sides) packaging? What kinds of items are you looking for in trade? That will help people know what you are expecting.
This thread should be moved to "Everything Else" in the traders forum.
RJ