Hmmm ... in SF I don't know. If you don't get a reply you might ask the owner of Grubstake if he knows.
Outside of SF some places you might call ...
Trade-Rite Market - San Jose
Spanish Table - Berkeley / Marin
Luso Mercado Delicatessen (haven't been there yet, but I have read the liquor section is great)
AVP International Market (San Mateo)
Sousa's Discount Liquor (Fremont)