In the jump point magazine they normal have an information article on a system in the PU
as part of this they give basic trade information (example below)
Market Deals — Castor
BUY: SILICA +2
SELL: LUXURY GOODS +3
SELL: BASIC FOOD +1

it appears that ultimatox from TRIDENT has recorded all of these to determine the best trade routes

https://docs.google.com/spreadsheet/ccc?...drive_web#gid=4