Airmail Paper?

I’ve nev­er looked for the stuff myself before today, hav­ing only encoun­tered it in let­ters from for­eign cor­re­spon­dents (MANY years ago).

But some­one asked for it on freecy­cle, say­ing she absolute­ly can­not locate any­one sell­ing it in Atlanta. So I start­ed searching.

The only stuff I can find for sale via Google is from San­rio. Ick.

Sure­ly this stuff can’t be that hard to find, even in the States. Surely.

Sug­ges­tions?