As one of its daily deals, 13deals offers this 8-oz. Stainless Steel Flask
for shipping. That's tied with our mention from two weeks ago of a similar item and the lowest total price we could find for a comparable flask today by a buck. This stainless steel flask measures 5.4" and features a screw cap. Deal ends December 4.
Of note, at checkout you can add a matching funnel for 79 cents.