 We have money news at 10 and 40 brought to you by PenFed. Great rates for everyone. High prices at grocery stores have many young adults turning to warehouse clubs to save money. The Wall Street Journal reports many shoppers in their 20s and 30s are getting memberships to Sam's Club and Costco. Then they're buying items in bulk and splitting the goods and the cost with friends, neighbors, and family. Sam's Club says shoppers ages 28 to 34 to 43 now make up a quarter of its members.