My saved searches on Ebay are paying off. I picked up a few Chris Davis minis recently that I probably wouldn't have otherwise noticed. I needed the base mini card, which I grabbed pretty cheaply. I think this was 99 cents. Not bad at all.
I found two more of the black parallels. The above one is numbered 2/10.
This one is numbered 10/10. I highly doubt I will find all 10. It probably wouldn't be too fair to other Davis collectors if I owned them all. It would be kind of cool to own all of the serial numbered versions of one card. Unless it is a 1/1, I think it might be near impossible to own them all. Worth trying, I suppose. I already have three of these, 2/10, 6/10 and 10/10.