They all sound like fun! I always enjoy joining in with My American friends but postage works out so expensive so I have to restrict myself
I'm also in the USA. The one swap I joined in on, they took the postage into consideration, and were willing to connect the USA people to another in the US if necessary. I was willing to swap with someone in Europe, so I don't know if there were other US people that actually were accommodated that way, or maybe I was the only American involved. Either way, depending on who signs up, it might not be required that you spend overseas postage.