Oni Press has made limited edition hardback versions of A Boy and a Girl to sell at conventions and via their web portals.
I have a small amount myself, and so have added a quantity to my own store, which you can buy and have signed by me.
The contents are the same in terms of interior pages, but you get a sturdier version with a nice metallic ink on the cover.
You can, of course, also order the regular version, as well as a selection of my other publications, in the store. I will be adding Natalie's art from the book soon. E-mail ahead if there are pages you want before it all goes up. golightly [a] gmail dot com