Maybe I can help. Cost of flavoring = $5 (equivalent of 33 cans) = 15.2 cents per can cost of CO2 exchange = $30 (for 130 liters worth of CO2) = 8.2 cents per can (33.8 ounces per liter *130 = 4394 ounces = .0007 per ounce = 8.4 per can) 23.4 cents per can = 5.62 per case or 2.81 per 12 pack. Now, this might be cheaper than your coke and pepsi (unless you usually wait for the sales, Target likes the 4 12 packs for $10 deal on my Pepsi and Mtn Dew), but you aren't getting pepsi or coke. Wouldn't you probably consider this like off-brand? This also doesn't count in the cost of the sodastream. Also, if you recycle your cans you probably get about 20 cents back per 12 pack there... And extra bottles for other family members. And a spare CO2 cartridge so you don't have to run to Target for a refill when it unexpectedly runs out (those are around $50 for an extra cartridge) So the question to consider is: Can you find off-brand soda elsewhere for under $2.81 per 12 pack? Don't get me wrong, thanks to the OP because this is a great deal on a Sodastream! I almost bought it when I saw this thread this morning! Haha. Started crunching some basic numbers though and uh-uh! I usually buy my soda on sale for $2.50 - $3 for Pepsi, and recycle, bringing it down to $2.30 - $2.80 per 12 packs. I would rather have my Pepsi and Mtn Dew So if cost is your primary incentive, no deal. Still could be good for others that like the convenience of having it around. All a matter of preference and what your incentive for buying it is.