Most cloth diapering families know that prefolds are the least expensive diapering system. In late 2009, Cottonbabies combined the cost-effective prefold with a one size cover to create the super affordable Econobum system. With a one size prefold and cover, Econobum is a great way to cloth diaper for about $100. Through February 28, 2011, this system got even more affordable. For every Econobum single (1 prefold/1 cover) purchased, get 1 free! There's no limit per purchase. At less than $5 a diaper, this is a truly exceptional deal. Even if you don't normally use prefolds, they are great to leave in your car or diaper bag as an emergency diaper. Stock up now while the deal lasts!