This week at Walgreens, Slim-Fast and Special K Protein bars and shakes are on sale for $5.00. Buy two and earn 3,000 Balance Rewards Points, later worth about $3.00. Combine the promotion with coupons and a Checkout 51 offer. Note that the Slim-Fast coupon has a limit of one. Pay $2.00 per pack of Slim-Fast protein shakes or $2.50 for Special K Protein!