Just wanted to forward along - Groupon's deal is for teeth whitening ($179) and Living Social's deal is for a boudoir session ($99).
I can't vouch for any of these vendors, but these two items are significantly discounted from what you would normally pay on the street.
As an FYI, I had my boudoir session with Laurie Peacock and I took advantage of a Groupon for BriteSmile for teeth whitening. Had a great experience with both!
Our wedding SDE:
Our wedding Feature: PW=demo