Which country would you be sending the cards from, out of curiosity? I might want to trade with you, but I'm in Korea, which is kinda out of the way, and I have virtually no idea how to use the postal service (will have to ask relatives). Really interested in your RoS cards though!
I live in Hungary. I only traded in Europe, and to the US so far, so I don't know how the postal service works between our countries, but I guess, it works just like to any other (at least from my part, I'm pretty sure).
Other: hopefully a huge RoS update will come in three days (my boosters are delaying for almost 2 weeks now, but seems like we finally worked out a date to meet and make our deal with my trade partner).