Amazon has 2-Pack BlenderBottle 28-Oz Classic Shaker Bottle (Black and Clear) on sale for $11.64. Shipping is free with Prime or on orders of $25 or extra.
Thanks to group member emazing for locating this deal.
Product Details
These shaker cups are for mixing protein shakes, smoothies, and dietary supplements
Uses 316 surgical-grade stainless-steel BlenderBall wire whisk ball for mixing
Screw-on lid creates leak-proof seal, and flip cap snaps securely shut to maintain contents contained; loop high for simple carrying or attaching keys