A return to in person, open markets where one can barter for a wide variety of goods will be the solution here. If anonymity is to be preserved. Doing things in person goes along way with building trust. I don't care about anonymity from the people in doing transactions with, only the third parties that might be watching.

Maybe a digital solution would be a market with buy in to participate, do your business, and cash back out after every transaction you made has been dually confirmed by you and the other party. The market should need no knowledge of goods purchased. Just a trade confirmation by both parties.