I have done shops at the airport in Mexico City. I can't see how one could do a shop at a store in a country where the clerks do not speak English unless you are fluent in the local language. I have tried for shops in Singapore without any luck.
I do see occasionally see shops at US miliary bases in various countries, but I don't have access to them.
Actually, I was offered a credit union on a miliatary base in the US today and had to tell the scheduler (who was in the Philipines, I think) that I couldn't get onto the base to do it no matter what the bonus was. She seemed very surprised that I couldn't just tell the MPs that I wanted to go to the credit union. I have done CUs in restricted company office buildings when they have a convoluted procudure to get in, but I was unwilling to take a chance on talking my way onto the joint base in NJ.
Shopping Southeast Pennsylvania, Delaware above the canal, and South Jersey since 2008