Don't forget when calculating materials costs and overhead all those nice little extras like your computer, printer, paper, ink, postcards, postage, electricity, water, and so on... things that so many digitographers seem to forget when setting their prices: "ooh, it costs me nothing per shot, so I'll charge twenty-five bucks for the shoot, and give them a CD with 2,000 images to choose from, all of which have been post-processed!".