The cost of Kudos Diapers changes depending on which purchase option you choose and the diaper quantity you need. A monthly subscription costs $78/month, which equates to about $0.36/diaper. A one-time purchase of a monthly box costs $88 or $0.41/diaper. Alternatively, you can purchase a half-month box for $45 ($0.42/diaper) or a sample supply for $14 ($0.52/diaper).