I still haven’t found them on their own, but I did find a mixed bag from Cinacia which has them mixed in with purple and yellow fingerlings (Purple Peruvian and Russian Banana I think). The problem is that out of about a dozen potatoes in the bag, only 2 were Crimson Goldfinger. And I ate one of them to confirm it…And yes, it was tasty.
Here’s a pic. The Purple Peruvians were also very good, so I’ll probably go back for more, though this time I’ll try to find a bag with more CG in it.
I found it at ACME, a store which recently bought out the A&P’s in my area. They also had bags of French Fingerlings on their own, which I also bought.