I hear you about the cost. I have no idea why they're more expensive, but most the products really don't work as good as the others. Definitely rethink buying the diapers. The brand we bought weren't as absorbent as expected.
I heard a show on the radio about this once and there is a rationale behind why it's more expensive, I just can't remember what it is. Something to do with the process itself in making and growing green and organic items and food.