Uncle A.
Google
I had a great experience buying Euros for an upcoming foreign trip. Marc's office is conveniently located in downtown D.C., and, a visit to him saved me a lot of time and hassle, eliminating my having to worry about obtaining foreign currency at the airport, under stress and possibly forgetting to do so.
Some misguided folks have criticized Marc's exchange rates. I think this attitude reflects ignorance and a lack of fairness. Marc's rates are better than airport currency exchange rates (per a query to Claude.ai). Plus, part of what you're paying for is the convenience and peace of mind of having cash in hand, prior to embarking on your trip -- that's one less thing to worry about. I'd use Marc again, without hesitation, and I readily recommend his services to savvy travelers who want to make their lives easier.