Coupons.com has released a printable coupon for $1.00 off Reach Floss. Walmart usually has Reach floss for $.97, and it goes on sale at Kroger, CVS, and other stores for $1 from time to time. So print this one now and you should be able to snag some free floss.
Head over to Coupons.com to print yours. You should be able to print two copies per computer.