SodaStream refills vary in price based on retailer and quantity purchased. A refill that makes 10 liters of homemade soda costs $7.99 on the SodaStream official website as of 2015. Packages of MyWater Flavor Essence contain three bottles that each make 20 liters of flavored sparkling water for $9.99.
SodaStream has a wide variety of flavors available for purchase. Online and brick and mortar retailers often have sales on SodaStream refills, so paying attention to sales can save money. Since many retailers such as Staples, Amazon.com and Wal-Mart sell SodaStream refills, they are easy to find a good deal on.