With your shopping habits and lack of doubling near you, coupons for groceries may not pay for you. You're the kind of shopper who would probably do very well at Aldi's if there's one near you.
The one area where I can almost guarantee you'd save with coupons is on health and beauty products. CVS, Walgreens, Eckerds and Rite-Aid all have amazing deals on a regular basis.
For example, this week Eckerds has a coupon in their flier for $10 off 3 Olay cleansers or moisturizers. I coupled that with a $3/2 manufacturer coupon and a $1/1 man. coupon and got 3 Olay cleansers for 68 cents.
Walgreens has products free after rebate every month, and even if you use a coupon you get a rebate for the full amount (and you get a 10% bonus if you get your rebate in the form of a Walgreen's gift card) so I often get back more then I paid, and then I roll it into the next month.
CVS has some good deals with their Extra Care bucks, particularly when you combine them with coupons.
Anyway, you might look into trying to save on your health and beauty costs more then your grocery costs. There's boards dedicated to each major drug store chain on:
http://www.dealagogo.com/
One caveat--if you're brand loyal, you're going to find alot less deals. I'm willing to try anything once for free, and there's very few things I've tried that were absolutely unusable. But hey, if it's free what have you got to lose? You might find things you like better then your regular brand.