Slim-Fast! 3-2-1 Ready To Drink, 10 Ounce (Pack of 8) ONLY $5.97 This post may contain affiliate links. Please see the full disclosure policy here. Posted on December 15, 2012 Written by Mary Leave a Comment Amazon lowered the price on SlimFast Ready To Drink Shakes, French Vanilla, 10 Ounce (Pack of 8) (French Vanilla Flavor) to ONLY $5.97 + Ships FREE with Super Saver or Prime Shipping! Reg Price is $14.97!