Hi psychosmart, your question made me think what I meant when I said that initially, and realised it was based on a feeling rather than hard numbers. Here's what I've worked out (sorry am working in pounds UK, will convert to usd at end!). All materials cost £45 (roughly 70us), and I think after putting the planning for the first one I could make one in two full time days. For it to be economical, I'd be making at least £100/days work, so would have to charge £245+ (~$400+), which to me sounds like a hell of a price for a satchel! I suppose the time side of the equation could be reduced quite a bit from practice and economies of scale. But I'm completely naive, I see lots of great buts on here and they might be selling for what I would call ridiculous money...