I haven't seen this, but as the larger supermarkets seem to sell virtually every known brand and type of booze, I wouldn' think you'd have a problem. You could try Spanish Style who have branches everywhere or there is a An excellent supermarket near (I think it's) Parque Santiago 11

"Spanish Style" on the ground floor of the San Eugenio Centre has it.

I bought a bottle there last summer

Thanks for the help, I will be out looking for the store when I arrive.