It might cost slightly more, but it will save you in the long run. Forget pennies, think about how much energy you will have saved. The bulbs burn brighter and last longer too. These normally come in three packs, so if that counts as econo-shopping, then you don't really have an excuse to buy just one. Well, unless you are slowly easing into this green stuff. However, you're not, so ratchet this thing up about now.