Russian Gourmet in Fairfax has fresh pastries and I've seen trubochkis in the past, although I haven't been recently. I have no idea why the top of their website says European Gourmet when it's clear from the photos what the store is called, but here is their info: https://rgfairfax.business.site/

Hi

Trubochki's are a family members favorite desserts and they can never find them, specifically the creme-filled ones. Looking to buy them for a Xmas gift. Cant seem to find them anywhere but thought DCUM might know of a local bakery that carries them or that could be made special order.

Thanks for any help!