Supplement Hut offers 4 Performa PerfectShaker 28-oz Shaker Bottles in a variety of of colors for $39.96. Coupon code "performa4" cuts that to $11.99. With $5.99 for shipping, that's tied with last week's mention at $4.50 per bottle and $22 less than you'd pay elsewhere. Each features a mixer ball and extra wide mouth.
This simple preventive measure takes just seconds to perform.