Cheapest soda stream exchange

[wondabar]

Where is the cheapest place to exchange a sofa stream cannister?

I’ve signed up to their own scheme.

The range is reasonable.

Their scheme is cheapest I've found.

Have a look at Co2you - not sure if it's any cheaper, but I'm using them for Quooker Co2 cartridges, and they are MUCH cheaper than Quooker. Great customer service too.