One way you don't want to transport wine out of EZE is by purchasing it Duty Free at EZE. We did so a little while ago; there are no bargains there and limited selection.
There are two duty free wine stores at EZE, it appears. Both are packed in the early evening as most int'l flts depart. We knew we wanted some bottles that are difficult to find in the US. We asked the salesman, who was actually quite nice. He directed us to a few labels, that I was unfamiliar with, though we drink a lot of ARG wine at home. He even ran in the back to get a last bottle of one label. In any event, we bought those, took them home (no problem). Though on this score one word of caution: apparently a certain amount of time before boarding of each particular flight, maybe 30 mins or so, they stop sales of liquids/wines. Not sure why. We were within that window and I had to beg the checkout guy to let us proceed, which he eventually did.
Of course, a few days later when I googled those labels to see if they were available in my area they were -- indeed found pretty easily. And at cheaper prices. The few dollars per bottle isn't such a big deal, though on one bottle was cheaper here by well more than only a few dollars, it was just that I didn't get what I hoped to be getting, wines I couldn't find here. Lesson learned for the next trip.
Interestingly, at a few restaurants when I explained I wanted a wine, usually a Malbec, that wasn't easy to find or or one that was produced in smaller batches, I was always directed to something excellent. I wrote down those names and, sure enough, when I google those here they can't be found at all.
I should have spent more time at Gaucho's incredible and beautiful store, which is well worth a visit. Cheers