NeweggFlash offers the CuiZen 17-Piece Personal Blender Set, model no. CPB-1017, for $18.99 with free shipping. That's the lowest total price we've seen, and the best price we could find today by $4 (outside the price below). It includes a motor base, five 16-oz. cups, 8-oz. cup, and four color-coded rings. Deal ends August 25.
A close price: Fry's Electronics offers it for $19.90. Opt for free in-store pickup to avoid the $11.89 shipping fee.