Swagbucks coupons has a Reach dental floss coupon that you should print ASAP - as it will reach print maximum soon. These are ALWAYS free when I go shopping. If you aren't familiar to Swagbucks, read an earlier post where I give you the scoop. You can print 2 of these per computer.
Here is the coupon link: http://swagbucks.com/p/coupons?cou=16150141