Just wanted to pass this along. You Swoop's (like Groupon) deal of the day is teeth whitening at Smiling Bright for $45.
I can't vouch for them, I did do a Groupon last year with Bright Smile and it was totally worth it (I paid $185).
http://www.youswoop.com/Default.aspxI think You Swoop has limited amounts so if you are looking to do something like this, definitely check it out!