For reaching 2,000,000 fans on Facebook, Old Navy is celebrating by offering a pre-sale coupon good for $2 Solid Rib-Knit Tanks today (Friday) only. Click here to print your coupon. Valid for women’s, girls, and toddler girl tanks. Limit 10 per Customer. See coupon for more details. You’ll be able to get it without the coupon Saturday and Sunday.