Amazon has the 60-count Emergen-C 1000mg Vitamin C Powder Drink Mix (Super Orange) on sale for $16. Add two to cart for $32 - 25% off coupon (check "Save an extra" box, eligible on first S&S order for this product)  - 5% off with Subscribe & Save (can cancel at any time) - $10 off $30 promo = $16 with free shipping on $25+ or with Prime. Less than 14 cents per packet.