trade ratio's

[Aerys_TarGaryen]

Hi need trade ratio's for a few things in storage namely

Titanium Ore
Titanium
Crossbows
Damascene swords
Wheels
Carts
Saltpeter
Gunpowder
Canon

these items are not supported in the online trade calculator
as i'm working on a trade calculator in excel. Any help would be apreciated.
Thanks in advance.