I agree with checking the WAHM-diapers on hyenacart (and not just 'cause I have one

) but also,

: to Jenlaana's suggestion. It's not difficult to sew diapers, even if you've never sewn anything before in your life. There are a ton of free patterns available, and lots of great step-by-step tutorials (all of the ones which I am aware of are collected in the first sticky at the top of this "Diaper Making" subforum).