Costco Deal: Philips Sonicare Airfloss 2 Pack (Model HX8254/70) $89.99

*UPDATE* 7/28/14. Costco has the Philips Sonicare Airfloss 2 Pack (Model HX8254/70) on sale for $89.99 (after manufacturer’s instant rebate), now through August 3, 2014. That is $30 off Costco’s regular price of $119.99. The manufacturer states that the Philips Sonicare Airfloss removes up to 5x more plaque between teeth compared to manual brushing alone. There are 2 modes: single or continuous burst. It helps improve gum health in 2 weeks…