Bare Escentuals is offering a free sample of their Matte mineral foundation plus a mini Buki brush for free. You do have to pay the $1 or so shipping charge. Even though the website says limit one per customer, you can actually get up to three free samples per order as long as you choose three different shades. The shipping charge for all three samples (as long as it is in the same order) is $1 or so. Have your credit/debit card on hand to pay the shipping charge.
I have never tried mineral make up but I am excited to try it now. Particularly since I have a chance to make sure I get the right color for my skin tone out of three choices.