Lancome is releasing a vibrating mascara in December. But you can buy a limited first edition of it today only (July 31, 2008) at select stores. Visit the Lancome Website for details.
Supposedly this can also be ordered through Sephora, but when I checked a few minutes ago, it was not available and it was unclear whether the item was sold out or not placed up for sale yet. It could be ordered on the Lancome site though.
I also heard this morning on Sirius Satellite Cosmo Radio, that they would be giving some away throughout the morning.