I don't know where I found 2 cards that I saved--one of the Fox and the other of 5 Points/the Candler Bldg. The artist is Henk Brinkman--Decatur, I can call him. They are great--black and white--? lithographs--not certain how to properly describe them.
The Atlanta History center had a few postcards--civil war and 1940's.
Eagle Eye books at North Decatur has a few. I looked around Decatur and didn't see a shop that looked promising--nothing in VA HI either.
This is the sort of souvenir that I would want if I visited Atlanta and also the sort of thing I would send as a gift to someone as a keepsake from Atlanta.
I know there is a nice ceramic gallery in Stone Mountain--that carries local artists--Southern Artistry, IIRC. I can try them.
Any other thoughts--this is kind of sad---hopefully the Atlanta Preservation Society will have some thoughts. If I visited I wouldn't begin to know where to go to find something that I would really want as a keepsake from a trip.