Stock up on Walgreens brand dental floss this month with an easy deal. Fifty-yard spools of floss are regularly $1.50 each when you buy at least two. Buy two and earn 2,000 Balance Rewards Points, later worth about $2.00 when redeemed for store credit. The final price is just $0.50 for floss! This is a monthly deal, so it’s not advertised in the weekly ad.