SodaStream Cylinder Refill in Canberra?

The newsagency at Manuka has a great supply

I did a swap of some at harvey norman Fyshwick

You can go swap them at many retail stores or online at the sodastream.com.au website.
Big W, Woolworths, Kmart – pretty much everywhere they are sold. You can’t get them refilled or do it yourself – you need to swap it for the price of the gas only.

“When you buy your SodaStream Drinks Maker, a full CO2 gas cylinder is included in your starter pack. With this Drinks Maker pack, you receive a one-off user licence which entitles you to use the gas cylinder throughout the life of your Drinks Maker. When the gas in the cylinder is used up, you exchange the empty cylinder for a full one, paying only the cost of the gas refill and the cylinder deposit.”

we get ours filled at K-Mart in Belconnen.