Amazon has the 12-Pack 12oz Diet Coke Soda Cans for $5.97. Click here and change to quantity 7 (84-Count Total) to reach $42 - $10 off at final checkout - 10% off with Subscribe & Save (can cancel at any time) = $28 with free shipping on $35+ or with Prime. Roughly $0.33 per can or $4 per 12-Pack.

• 3× 12-Pack 12oz Coca-Cola Zero Sugar Orange Cream for $13
• 6× 12-Pack 12oz Coca-Cola Soda for $26