As one of its daily deals, 13deals offers this 6-oz. Stainless Steel Flask
. Coupon code "DN-13FLASK" cuts shipping to $2.99
. That's tied with our mention from a week ago and the lowest total price we could find for a 6-oz. flask by a buck. This stainless steel flask measures 5.4" and features a screw cap. Deal ends April 31.