2 series of questions to ask yourself.
(1) is it really a matter of space or am I a tight arse? No offence intended.
Do you want this small keg from the States because of it's size and similarity to the Heiny kegs or because of it's apparent cheapness? Post from the states is always going to be worth more than the item. If it is REALLY exactly what you want, then that is what you will have to pay if you want it. It couldn't be more than $100 for post; so that's about $111 for a mini keg. Doesn't sound too bad (except see "However" in the next point).
(2) do you have a history of home brewing? Do you have enough space for brewing if space is such an issue? How are you going to charge the keg and dispense the beer? I looked at the website and you can buy a 'party star deluxe tap system' for it.
However, it also says the
kegs are only good for 6 -8 uses before needing to be replaced.
HOW ABOUT: a solution from WA. A stainless steel 12 Litre keg that is only 28cm x 28cm or a SS 9 litre keg that is 21cm x 36 cm? If you could fit 10 Heinies in the display fridge, surely you fit in a few of these? You can use them and use them and use them as many times as you want. There is even a party keg charger & dispenser kit so you don't need a gas bottle & reg (would be the same as the mini keg, i.e priming the keg with sugar for another fermentation to gas it up; then use the CO2 gadget for dispensing). They're available from WA here
LINKY. They are not cheap (but are not disposable either) and freight is still steepish out of WA though, but certainly not as much as out of the States. It would seem to be a possible solution for you but it comes back to (1).
If you want cheaper, you may have to go bigger.
EDIT: Well as BribieG says, a 2L PET is almost a mini keg... and a lot simpler too.
