Lavinia
Diagonal 605
About
Sort of like a wine megastore, Lavinia makes selection easy because all their products are displayed according to country of origin: from Germany to Uruguay, Australia to California. As expected, the Spanish section is the most extensive, bulging with Riojas, Priorats, cavas, albariños, and sherries. There is a pack-and-send service, which is handy as most bottles come cheaper by the dozen (check your country's laws about what/how much you can send back).