When you make a qualifying purchase of over 70 pesos at one these stores you can request a Global Refund Cheque. This entitles you (a non-Argentine citizen) to a rebate of the VAT (value added tax) when you leave Argentina.
Stores that participate in the Global Refund program will display a “Tax Free Shopping” sticker in the window. The refund applies only to products manufactured in Argentina.
The refund amount is the VAT minus an administration fee. The VAT rate in Argentina is 21% or 17.35% of the final price shown on the price tag. (In Argentina, the VAT is included in the sticker price, not added on later at the cash register.)
You can collect your refund at the airport when you are leaving Argentina. First, make sure you get your Global Refund Cheque stamped at customs BEFORE you pass through security and head to your departure gate. Then take your check to a Global Refund booth.
On my last trip to Buenos Aires I made the mistake of taking to my refund check to the booth near my departure gate. Since I didn’t get it stamped at customs before entering the secured area, I couldn’t claim my refund. That’s 39 pesos I will never see again.
More information at the Global Refund Argentina website.