Amazon has the 18-Pack Polar Seltzer Water Sampler Variety Pack (12oz Cans) on sale for $11.23. Add 3 to cart for $33.69 - 5% off with Subscribe & Save (can cancel anytime) - $11.22 off multibuy discount = $21 with free shipping on $35+ or with Prime. $6.93 per 18-pack. 

• 54 cans total. Flavors include: Strawberry Watermelon, Ginger Lime, Toasted Coconut, Blackberry Mango, Orange Vanilla, and Pink Apple & Lemon.