Sherrie,
I agree....YOU CAN DO THIS!!! Here are a few simple rules that I follow for myself when I go the store....because I'll admit I am the worst at buying everything that looks yummy.
Never shop while you're hungry.
Always make a list and stick to it.
Try very hard to shop alone.
Whenever I am forced to get snacks for my kids or my husband I always remember to get stuff for myself too. Since low carb snacks are hard to come by I usually stock up on jerky, nuts, string cheese and protein bars. That way, when they feel the need to pig out on popcorn or ice cream then I've got something too!
Good luck! Stay focused! And, remember you've got us!
Jenniwookie