The Market for Unpublished Lewis Letters

There've been a couple of auctions of lewis letters. i'm also an addition to books i'm interested in, especially i find myself interested in things that will be of value to researchers or scholars. And some of his unpublished letters, and the're a couple of those that i've wanted that have gotten away. My motivation is not to acquire them just for myself, but eventually so they can be like you andrew, to share them with a place where others can see them.