With orders of $25 or more, Amazon offers its Prime members the BlenderBottle Classic Loop Top 20-oz. Shaker Bottle
in 17 colors (Aqua pictured) from $5.09
with free shipping
. (Non-members can spend $49 or more to qualify for free shipping; otherwise, it costs an extra $8.38.) That's the lowest price we could find by $2. It features a loop top, ergonomic flip cap, tapered spout, and is dishwasher-safe.