Here's the link to the $15-off rebate
Some details: You will need the original UPC and receipt (dated between 7/1 and 8/25) to send in with the rebate form.
Form must be postmarked by Sept. 30
This deal gives you the following:
*12 month supply of whitestrips
Shipping is free if you have Prime or if you spend $25+ otherwise it's $5.61