A few weeks ago I received my COMC order which contained a very awesome buyback autograph numbered 1/1.
I discussed awhile back how I received one in a group break. You can revisit the post from almost two years ago here.
Topps Heritage cards and Allen & Ginter make great materials for buyback autographs.
Here is a picture of all 15 of my 1/1 Archives Buyback Autos.