Will You ship outside of the US

I routinely ship outside the U.S. and do everything I can to keep the costs to a minimum. The USPS is the only shipper I've used because I've heard UPS / FedEx charge outrageous brokerage fees.

I'm STILL trying to figure out where the amount of taxes and fees imposed on my customers come from. There doesn't seem to be any rhyme or reason to the number from what I've seen; does anyone know what they base these amounts on whether it's the stated value, the amount of insurance desired or what???