be careful with the small cartridges. I dont know if they refill (which is wasteful), and they do like one bottle. I bought 2 soda streams (one is a backup spare, and it gave me the extra CO2). I was burning through 1 bottle a month ($15 exchange at BedBathBeyond).
But I ultimately splurged and bought a 5lb Tank I put in the cabinet This too costs $15 to refill, but it lasts 2-3 months. (I also make my drinks much more fizzy with that huge tank). That and a special cable from Amazon… [But ONLY do that if you are a heavy soda drinker]…
Honestly at the original $15/month with the exchange, it wasn’t bad. Some places will REFILL them for about $8-$10… But it’s hit or miss, and takes too long for me to wait! A spare bottle is $30.
When you factor it in, it makes a lot of sense. I originally did not do it because the cost was too high. When I found out I Could REFILL the units near me for $8, I bit. Then I found the bigger tank. Which I keep turned off (until I am ready to make some soda).
I also learned that adding sweet stuff KILLS my ketones. It doesn’t take much. And I’m talking Sucralose, not “actual” sugar.
It beats lugging a bunch of 2 Liter bottles from the store and then having some go flat!