If you are like me and drink a lot of carbonated water/soda then it is at least 10x cheaper to go with a DIY system. I started with a sodastream, tried one of those adapters to use it with a bigger tank and that did not go well, but now I'm 2 years in with the following system (everything but the carbonater cap are intended as generic examples)
$100 - 10lb CO2 tank http://www.amazon.com/dp/B00852CTYK/ $15 - 1 CO2 tank refill at local gas supplier, makes 500+ liters $10 - hose and ball lock http://www.amazon.com/dp/B0064OI77Y/ $15 - carbonater http://www.amazon.com/dp/B0064OKADS/ $40 - Dual-Gauge Regulator with 5/16" shutoff barb http://www.amazon.com/dp/B00HJDPUKG/
Here's a video about how it works, the guy got his CO2 tank out of a landfill, I wouldn't do that because you won't know if there are any contaminants in the tank.
I still use sodastream syrups, but most of the time I just drink the carbonated water because the bubbles are pretty refreshing on their own.
The following is from another website, same model, lower price.
Kohl's offers the SodaStream Source Home Soda Maker Starter Kit in Red, model no. 1019511016, or Black, model no. 1019511015, for $40.99 plus $10.95 for shipping via the directions below. Plus, you'll earn $10 in Kohl's Cash. (It can be redeemed online or in-store from May 27 to June 8.) Assuming you'll spend the credit, that's $57 under our mention from a year ago and the lowest total price we've seen. (It's a current price low by $17.) This kit makes up to 60 liters of soda and includes a reusable 1-liter BPA-free carbonating bottle, fizz-preserving cap, 6-pack flavor sampler, and reusable CO2 canister. Deal ends May 26. To get this deal: Add the SodaStream Soda Maker Kit to your cart for $80.99 apply coupon code "TEN4YOU" to drop it to $70.99 apply coupon code "HONOR10" to cut it to $60.99 redeem this $20 mail-in rebate for a final price of $40.99
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