Here's a deal for the more inventive among you.
2.6KG Gas Cylinder filled with carbon dioxide. Just what the hell would you do with a cylinder full of CO2 you ask?
Well, there are many uses. You could hook it up to a piece of pipe and use it to shoot off projectiles (paintball works this way). You could make an attachment to join it to aerosol cans, and allow you to fill them back up so you didn't have to waste that last little bit left inside. Or you could connect a lance directly to the tank, and use the whole thing as an extra large air duster.
There are many uses if you're creative enough, but for most consumers there are two big ones: Dispensing beer out of a keg, and making drinks fizzy.
We're going to concentrate here on the second one: making drinks fizzy
Option 1 (Already have a Sodastream)
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Buy this for $48
It will go from the gas tank directly to your sodastream, and you won't need to do anything else. Super simple. -
If you don't have a sodastream, you can by a knockoff from Spotlight. They have them on clearance for $39 currently
Note: according to post here there may be issues using sodaking -
Total Cost including gas cylinder: $117 plus postage ($156 if you need to buy the sodaking)
Option 2 (Starting fresh)
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This is a little trickier, but more flexible. You can carbonate to whatever pressure you want, making drinks extra fizzy or only slightly fizzy as your tastes demand. It also allows you to carbonate 2L Coke bottles directly, which in my mind is much better.
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You will need the following items
Regulator - $40. Needed to reduce the pressure to working level.
Plastic tube - $12. 12 meters long so plenty of line if you want to hide the gas bottle somewhere else out of the way.
Clamps - 70c each (3 needed)
Ball lock $2.60. Joins the gas line to the carbonation cap
Carbonation cap $8.90. This beauty is the key to the whole process. It allows you join your carbonation setup directly to a standard soft drink bottle, which has a very unique and hard to match thread, and pressure it with gas. -
Total cost including gas cylinder: $134.60 plus shipping.
Given that Kmart exchanges sodastream gas cylinders, and each cyclinder contains 400g gas carbonating 60L of soda water, this tank is equivalent to 6.5 refills. At $19 a refill, thats $123.50 for the gas alone. Where this really saves money is on the second refill. To refill a 2.6KG tank, most places charge $25-$30. That's $30 for the ability to drink a litre of soft drink every day, for a whole year. Not recommended, will probably kill you, but damn if that isn't a cheap way to do it.
Postage
Kegland is based in Melbourne, so postage rates vary. For me (melb) it was $12 for the cylinder alone. For Sydney it goes up to $18.
Waiting for mentos to go on sale now.