Maybe for Christmas
I’ve got some strategies for avoiding the grocery store begging that plagues many 
mothers of young children. First of all, my kids know that when I say no at the grocery store I never give in. Although I’d like to claim that this is because I’ve mastered the element of consistency in parenting, I know that my sense of frugality is sometimes my driving force. The other thing I do is use phrases like "maybe we can make a treat at home" or "we should ask Santa to get you that for Christmas." So far these phrases have worked wonderfully and my kids forget about the desired item entirely by the time we get home!
I could tell Isaac was ready for lunch one day when he started eyeing and asking about the candy in the check-out isle. When he asked me for a particular treat, I told him that perhaps we could make a treat when we got home. He put the candy back and I felt proud of how easily I had avoided a tantrum. He stared picking up candy bars, starbursts, and other impulse items one at a time and saying "maybe we can make something like this at home, " and luckily he put each one back without a fuss. The lady behind me was stunned and commented that she’d never seen a kid so pleasantly accept his mom’s refusal to buy a treat. One time I commented on how he seemed to want us to make our own check-out isle. He liked this idea and regularly comments to me at the store about how our check-out isle should look.