I just learned that Paypal charges for international currency exchange. The "fee" comes in the form of a poor exchange rate. There is a way around this though, it's just hard to find. You may be aware of this already, but if not the steps to get around it are below. Save money of your next tea order!!
Paypal > Profile (gear icon) > Payments > Preapproved Payments > Set Available Funding Sources > Conversion Options > select "Bill me in the currency listed on the seller's invoice"
You need to do that for each payment source with the "Conversion Options."