I stay ready to snatch up 1/1 Archer Sketch cards from the Cryptozoic release of a decade plus ago. They truly don't appear often, and recent sales data shows they are going up in price. Considering the wax dried up and there are only but so many to begin with (about 3600 in total from what I've read) that is not all that surprising a fact. I am just fortunate they were affordable for as long as they were. A bunch recently hit eBay and I was lucky enough to secure six of them.
Four came in one purchase and two of those are from the hands of the same artist -- Josef Rubinstein.