I use what coupons I can for the commissary.
I have friends that send me coupons, but most of what they send, I cannot use because the commissary doesn't sell the brand.
I do print, print, print from the internet.
With our pending move coming, I signed up for ezmeals, which gives me a shopping list. That way, I only buy what I need.
Most I've ever saved in the states shopping was about $70. That was about 10 years ago. Was at a grocery store that had the "buy one get 2 free or 3 free and some things were even buy one get 5 free". Gotta love those! Between that and the coupons I had, shopping was fun that day!