The plant display at this hardware store was nothing incredibly special for the area—in fact, I had seen much better displays in the window of a closed nail salon near the hostel, with Echeveria priced at $1 for each huge floret and a giant tub for $10, for example.
But, the only gesneriads I saw (literally, only gesneriads I saw the entire trip, although I made no special point of seeking them out) were at this hardware store: a tortured, tattered pink-ish Episcia and some rough-looking Columnea that were barely in bloom.
Maybe I'm biased toward gesneriads (that's misleading: I am biased), but I hope other hardware stores and plant centers in San Francisco treat these friendly, awesome gesneriads a little better! I imagine that many gesneriads could grow quite well in that area.