I Need Your Help with My Grocery Shopping

I've been trying to change up my grocery shopping strategy and I can't figure out which way I'm saving money, if at all. So, I'm asking you for help!

For years, I've gone to the grocery store on a Saturday or Sunday morning and stocked up for the week. Lately however, I've been going one day during the week and one weekend day, trying to only get a few items each time. I think I'm actually spending more money going twice a week. It gives me more of an opportunity to buy items I don't really need.

How do you shop?  Once a week?  Twice a week?  Daily?  Tell me how you save money at the grocery store. Aside from coupon clipping, any other suggestions on how I can save some coin?