Soda Stream carbonator refilling

My original Soda Club Edition 1 (left) and latest SodaStream Power (right) One of the first things you'll find after you buy a "carbonator" from Soda Stream or others is the CO2 refill bottles are very expensive, assuming you can find somewhere than sells them. Too expensive in fact. It's likely you can buy case of Pellegrino at Costco for less per litre than you'll pay for the 60L CO2 refill bottles. So, all you're getting with Soda Stream is the opportunity to drink local tap water, which likely is not as good Pellegrino, what with Clorine and Floride being added. At least it's easier to carry a single 60L CO2 bottle home than a case of Pellegrino. Now CO2 being one of the most common gases on Earth, one would think it would be cheap and easy to obtain, and it is. Soda Stream more or less is charging you $40 for a bottle of compressed air. The only trick is getting CO2 into the bottle under pressure. At that price point most ...