If you need to empty inventory, any price over the buying threshold is profit, so it's alright to dump your inventory if you know that the next cities in your route doesn't pay well for those goods.
BUY under X means buy when the buying price is below X.
SELL over Y means sell when the selling price is over Y.
If you don't have much trading skill in your party or the economy a town is bad because of war, you might not get prices as high when selling. Drop the selling prices by ~10%.
For buying, avoid buying for higher than the threshold. Just move on to another city.
Most Profitable Goods:
These are the main items you are looking for when trading.
BUY under 150
SELL over 300
BUY under 150
SELL over 270
BUY under 320
SELL over 450
BUY under 380
SELL over 450
BUY under 700
SELL over 950-1000
BUY under 200
SELL over 300
BUY under 600
SELL over 800
BUY under 100
SELL over 150
BUY under 220
SELL over 350
*Wool Cloth
BUY under 200
SELL over 270
Filler Goods:
Buy to avoid travelling empty if the above are not available.
*Date Fruit
BUY under 70
SELL over 120
BUY under 30
SELL over 100
BUY under 90
SELL over 100
BUY under 30
SELL over 50
If you have inventory space between towns, stop in villages on the route and buy cheap items. Buy a large variety of food from those villages to keep your army fed and morale high. The money spent in villages also increases prosperity of the region.
Here is an image with the route described below.
The format below is:
#. Location:
BUY UNDER: Item Price (only buy under this price, if the price is over then leave it.)
SELL OVER: Item Price (only sell over this price, if the profit is lower then keep it.)
Ruvar, a village near Wercheg:
BUY UNDER: Salt 150
Wercheg:
BUY UNDER: Salt 150
BUY UNDER: Hides 90
Curaw:
BUY UNDER: Iron 150
BUY UNDER: Tools 380
SELL OVER: Salt 270
Ismarala, a village near Curaw:
BUY UNDER: Iron 150
Fenada, a village near Sargoth:
BUY UNDER: Flax 100
Sargoth:
SELL OVER: Salt 270
Tihr:
SELL OVER: Iron 300
SELL OVER: Tools 450
Kwynn, a village near Sargoth:
BUY UNDER: Flax 100
Sargoth:
BUY UNDER: Flax 100
BUY UNDER: Linen 220
BUY UNDER: Wool 70
Uxkhal:
SELL OVER: Hides 100
SELL OVER: Wool 120
Suno:
BUY UNDER: Oil 320
BUY UNDER: Wine 200
Shariz:
BUY UNDER: Date Fruits 70
SELL OVER: Linen 350
SELL OVER: Wine 300
Durquba:
SELL OVER: Flax 150
Ahmerrad:
BUY UNDER: Iron 150
BUY UNDER: Wool 70
SELL OVER: Wine 300
Bariyye:
BUY UNDER: Date Fruit 70
BUY UNDER: Iron 150
BUY UNDER: Salt 150
BUY UNDER: Tools 380
SELL OVER: Linen 350
SELL OVER: Wine 300
SELL OVER: Wool 120
Iqbal, a village near Bariyye:
BUY UNDER: Salt 150
BUY UNDER: Date Fruit 70
Fishara, a village near Bariyye:
BUY UNDER: Salt 150
BUY UNDER: Date Fruit 70
Uzgha, a village near Ahmerrad:
BUY UNDER: Iron 150
Tulga:
BUY UNDER: Spice 600
BUY UNDER: Salt 150
SELL OVER: Iron 300
SELL OVER: Date Fruits 120
Ahmerrad:
BUY UNDER: Iron 150
SELL OVER: Spice 800
Durquba:
SELL OVER: Spice 800
Jelkala:
BUY UNDER: Velvet 700
BUY UNDER: Fish 30
BUY UNDER: Hides 90
SELL OVER: Iron 300
SELL OVER: Salt 270
SELL OVER: Tools 450
Veluca:
BUY UNDER: Grain 30
BUY UNDER: Hides 90
SELL OVER: Fish 90
SELL OVER: Velvet 950
Uxkhal:
SELL OVER: Grain 50
SELL OVER: Hides 100
SELL OVER: Salt 270
Suno:
BUY UNDER: Oil 320
BUY UNDER: Wine 150
SELL OVER: Grain 50
SELL OVER: Hides 100
SELL OVER:Salt 270
Praven:
BUY UNDER: Wool 70
SELL OVER: Oil 450
SELL OVER: Salt 270
Yalen:
BUY UNDER: Wine 200
BUY UNDER: Wool 70
SELL OVER: Salt 270
Jelkala:
BUY UNDER: Fish 30
BUY UNDER: Velvet 700
Shariz:
BUY UNDER: Date Fruit 70
SELL OVER: Fish 100
SELL OVER: Wine 300
Dhirim:
BUY UNDER: Iron 150
SELL OVER: Velvet 1000
Optional:
Visit Narra and Ichamur, sell according to thresholds.
Tulga:
BUY UNDER: Spice 600
SELL OVER: Iron 300
SELL OVER: Wool 120
Bariyye:
BUY UNDER: Iron 150
SELL OVER: Velvet 1000
Ahmerrad:
BUY UNDER: Iron 150
BUY UNDER: Wool Cloth 200
SELL OVER: Spice 800
Durquba:
SELL OVER: Spice 800
Halmar:
BUY UNDER: Salt 150
Dhirim:
BUY UNDER: Iron 150
SELL OVER: Wool Cloth 270
Reyvadin:
SELL OVER: Iron 300
Khudan:
SELL OVER: Iron 300
Rivacheg:
SELL OVER: Iron 300
If anyone has questions, feel free to ask.
This is only one of many trade routes you could take in the game and will obviously change depending on tensions and wars in your playthrough.
The above route does not include some trade materials, such as raw silk and olives, but is still an absolute benefit to any upstart merchants.