I've long championed handwritten correspondence. And it took me some time to get organized, but I'm now a proud member of the Letter Writers Alliance.
As they note: In this era of instantaneous communication, a handwritten letter is a rare and wondrous item.

Based in Chicago, Kathy and Donovan, the founders, hold socials and workshops to help promote the art of letter writing. And they have a fantastic online shop (most of it just for members!) full of stationary, vintage stamps, and ephemera. Looking forward to taking advantage!