Once upon a time, a trip to the grocery amounted to two brown bags and a $70 tab. Then came baby and the bill doubled along with the loot. More mouths to feed means more food to buy, making bulk purchases more attractive. On any given Saturday, moms can be seen sweeping the aisles of Costco or Sam's heaving packs of toilet paper and diapers into her cart. She can avoid multiple trips and escape the exorbitant bills of the local grocer. And if disaster strikes, chances are she'll have enough toilet paper and prepared foods to get her family through a storm.