13 Deals has a 2-Pack of 24oz Fit Turbine Drink Mixer Bottles for $10 - $5 off with coupon code DN-TURBINE
[Exp 1/31] = $5
with free shipping. Cups are designed for mixing protein or meal replacement shakes and include a removable mixer piece that dissolves powder quickly and eliminates clumps. They go for $15 apiece on Amazon.