Old Navy: $2 Tanks Tops Sale In-Stores (reg $8.50) 1 Comment Old Navy is having its super $2 Tanks Sale tomorrow Saturday, 3/29 ONLY!! Limit 5 per person. You will definitely want to get there early to get the best selection!! If you are an Old Navy Cardholder, you can head on over today 3/28 and grab yours early! If you need to shop online instead, they are $5.00 at OldNavy.com. Shop through TopCashBack and get a 4% Cash Back Rebate too!