I save $ by doi the majority of my grocery shopping online and having it delivered to my home. I have found this process quite helpful.
-it totals as you put items in your basket
-store coupons / deals are automatically given to you
- online store coupons available
- great selection
With this way of shopping you do it when you want, have it delivered when you want.
There is a small delivery fee, but if you order over $150 you get delivery free (which is the case 99%of the time for me).
I really like the way it totals as you go...no surprises at the checkout.