I note that you guys are working on FedEx Shipping.
I wonder if you might also consider adding shipping by DHL. The cost for DHL Worldwide seems to me to be generally cheaper. For example: US to Thailand, DHL costs about $40 for a document envelope. USPS costs about $65 - that's what I spent the other day.
I don't know about FedEx to Thailand, but I have not seen FedEx very well represented here, whereas DHL is seen everywhere.