I got one earlier this year, the 'source' model with LED display to show you how much fizz.
It gets lots of use as we have 3 kids.
The syrups, you can get low sugar versions, which we tend to go for.
Register on sodastream website and every so often you will get discount codes and reduced delivery options.
If you have a Range store near to you they usually have the bottles for about £4 each.
I would have suggested a spare bottle, but looks like Bechet45 has sorted you out.
And I work round the corner from the Sodastream factory in Peterborough (I presume its now just distribution). I'm not sure whether its as rough as the occupied west bank, but lets say you don't go out alone at night around here.
And I think Scarlett Johansson was Sodastream ambassador, so it may not put hairs on your chest, but its not done her any harm.
Get busy with the fizzy!