louisville, kentucky. our first stop? the babysitters. all right, so we're going to go meet laura and frankie. hi, laura, how are you? laura is babysitting 1-year-old frankie. her charge? free. across town -- now we will see a photo shoot. becky, a professional photographer, is taking her family's portrait. her price? also free. how much do you think you're saving? >> at least $250. >> reporter: what's the catch? laura, becky and her neighbors are doing something called time banking. instead of paying with money, they pay with their time. and everyone's time is equal. it is organized through time bank usa. national group that helps communities get started and track their time. and time banking is booming. now in 42 states in just three years, the number of time banks across the country have nearly doubled.