A teensy bit off topic, and perhaps it's already been mentioned in this thread, but I wanted to give some props to Everyday Minerals. I used BE for a long time, and loved it, but the price is steepish. I found Everyday Minderals last year and they are MUCH, MUCH less expensive, especially when you buy their big custom kit. The foundation doesn't cover *quite* as well as BE, but at 1/3 - 1/5 the cost, I'm cool with that. I can layer.
AND.... you can order free samples (plus $3 shipping) to figure out what shade of foundation you are. The foundation colors are less forgiving than the BE colors, so you have to find a really close match, but they make up for it by having lots and lots o' choices. It just might take you a while to find the right shades. The sample pack is 3 foundations, a blush/bronzer and a cover-up. Each sample will, no joke, last you a week.
OK, I'm done sounding like a Mary Kay sales rep.
www.everydayminerals.com
ETA: 'mkay, I figured it out. They no longer do kits, but when you order 5+ full size items, you get 25% off, and when you order 12+ full sized items, you get 45% off.