On my recent trip to Budapest, a new shop in the Castle of Buda caught my eyes:
Located in royal and private wine cellars from the medieval era that had been closed to the public until now, the Royal Wine House has a museum presenting, among other things, Hungary's 22 wine regions, the "Wine Orders," and the Grape Culture of Medieval Buda. You can talk to the sommelier and choose a set of wines you'd like to taste, and there is also a store where you can purchase wines.
I've already been to the nearby House of Hungarian Wines a couple of times. It looks like they've got a competitor now!
[Editor's note: Could this be one of the places Martin and I are going to visit together the next time he comes to Hungary?]