Amazon has the 15-Pack 16oz Monster Energy Zero Sugar Energy Drink (Variety Pack) for $25 - 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) = $17 with free shipping on $35+ or with Prime. Roughly $1.15 per can. 

• Flavors include: Zero Ultra, Ultra Peachy Keen, Ultra Strawberry Dreams.