Spain/Portugal/Gibraltar - Madrid - Wine Sales and Packing?

Can anyone recommend a wine merchant in Madrid who will pack wine for shipping as checked luggage? I'm in Madrid next weekend and wouldn't mind buying a case or two of good wine and checking it as luggage. But I need to be sure the packing will ensure no breakage. I'd be grateful if anyone has a recommendation.

Good question. I mostly buy wholesale and can't recommend a retailer now, but most good wine merchants who sell by the crate should be able to help you. What kind of wine are you looking for?