The quest for absinthe in Madrid, part I

My husband told me about a wine shop near his place of work that had absinthe on its shelves.  Today I got there to take a look.  After looking around, I did not see it so I went to talk to the sales man and this is how the conversation went:

Me: Excuse me, do you have any absinthe?

Sales man: Yes, it is over here – goes to a shelf, looks around and says – Oh, I think I sold my last bottle.

Me: Oh.  What brand is it?

S.m. (Surprised): Brand?  It’s the only one that exists.

Me: (Puzzled look) There are about 50 brands of absinthe.

S.m: Oh, really?  This one comes in a slim bottle and it’s green.

Me, thinking to myself: "That is not much help."

S.m. # 2, joining the conversation: We have the one that sells the most.

Me, thinking to myself:  "It’s no wonder it sells well, it’s the only one you have."

S.m. # 1: It’s from Catalonia, that’s all I know.

Me: Well, thank you very much for your help.  Bye.

Note to self, living the shop: Do not come back here for absinthe.