Amazon has the 12-Pack C4 Smart Energy Drink (Cherry Berry Lime, 12oz cans) on sale for $19 - 30% off coupon (first S&S order for this product) - 5% off with Subscribe & Save (cancel anytime) = $12.51 with free shipping on $35+ or with Prime.

• Roughly $1.04 per can. Zero sugar, 200mg of caffeine