Well, Marketplace on Oakton and Eurostyle Deli at least had heard of them but didn't carry them. On a whim, I asked at the Customer Service desk at H-Mart - it was amusing to see the thought "Who pickles
walnuts ? move across the face of an employee whose store has an entire wing devoted to pickles (she very politely told me they didn't carry them.) I'm not sure I will have time this week to head to parts south, but am headed to Cost Plus for other things, and will check their European food imports while I'm there.
Thanks, everyone!