I love this powder! It does not add color to your face, and the makeup artist who sold it to me told me that women of any and all skincolors could use this (provided that they don't put way too much on).
This powder sets my foundation beautifully, and is best applied with a velveteen puff rather than a brush, although I've used a brush with no problem. You only need to use a little to get the job done, so it lasts for a long time. I forget how much I paid for it, but I'm thinking it was in the $35 - $40 range. You can look up Laura Mercier on http://www.lauramercier.com .