When my PC adventured in the Shadow Elves territories I wrote down a classification of the 4 main cities based on the economical system given in Gaz9 and Gaz11.

City	Class	Modifiers to Price Adjustment
City of the Stars	B	Common Metals -2, Mounts -2, Armours +2, Weapons +2, Tobacco +2
New Grunland	C	Food -3, Beer (Fungal) -2, Silk +3, Weapons +2
Alfmyr	D	Precious Metals -2, Armours -2, Weapons -2, Food +2, Wood (Fungal) +2
Losetrel	E	Silk -3, Textiles -2, Cloth -2, Food +3, Oil +2, Dye +2