Not sure if you have these, but Emer I has the exports for Sarnak listed as wine, wool, salt, wood, weapons, armour, steel tools and mercs, and the imports as wheat and corn from Vornia, red meat from Vajaar and grains and cotton from Bodlea. Eidolon lists the exports as cranberries (unheard-of elsewhere), rice, wine, steel weapons and mercenaries (amazons) and the imports as wheat, corn, tubers, red meats, spices (pepper, cinnamon).