To write to Elder Stuart, a stamp is $1.20.
I found a guy in North Salt Lake that sends packages to Argentina! His website is:When I spoke to him, he told me he has family in Argentina and goes there every so often and can send your package from the website with no customs, which means missionaries DO NOT have to pay to receive their package!! I'm definitely going to try it for Christmas!!
Thanks for all your support to Elder Ryan Stuart!!