There is a new promotion on Emergen-C products at Target: buy two and receive a $5.00 Target gift card. Match this promotion with a printable coupon (you must share the coupon), and score two boxes for free. Then submit for a $1.00 Checkout 51 offer, making this purchase a $1.00 moneymaker!
Not all stores carry this size. I found these located in the travel section of my store. To check inventory at your store, visit BrickSeek and enter DPCI 094-02-1895.