I first drank Genny cream ale when I was 16 at my uncle's farm in Upstate NY. Could never find it here in Texas, until recently. Spec's now carries it, and the sell out of it all the damn time. Seems like every time I go in, they only have a few left - the beer dept. guy tells me that when they have it, people buy 2 or three cases at a time.
Not sure if it is a case of a few folks like myself that miss it wiping out the stock every time, but I grab a 12 pack when I can.
As for beer that I miss, can't think of one that I just pine away for now that I can get Genny.