Diapers are one of those necessary evils that are going to be around for a couple of years. So why not start saving sooner than later? While the most cost-effective solution is to use cloth diapers, that's a mess with which most people don't want to contend. Diapers can actually cost you an arm and a leg, especially if you don't shop smart. Avoid buying diapers at the grocery store, where you get far less bang for your buck. Instead, shop for diapers at Sam's or Costco where you can buy them in bulk. Amazon.com and other Web sites also have good offers if you have no warehouse clubs in your area. Look online for coupons. Of course, the number one way to save on baby costs is hand-me-downs. Whether it's clothing, toys or furniture, take what you can get. By accepting these things, you'll shell out less.