Cloth diapers! CottonBabies.com sells cloth diapers and also has this "diaper grant" program giving free diapers to missionaries. They sent us a bunch of diapers for free! @Caidy Quilaton - Good to keep in mind for the future if you are interested.
The Grovia all-in-one cloth diaper is the reason I made the switch. Trim fit, easy-to-launder, will fit from 8-35lbs. It's shocking how easy it is to use this diaper! (Added bonus--saving tons of money on diapers over disposables!) I like the GroVia when baby is younger, but I switched to TotsBots Aplix when she got older and more wiggly on the changing table.