Hey Gav,
Another option if you dont mind a little mucking around. I have used QA1 proma star alloy bodied shock. Ordered from the US they came in about $880AU delivered for 4, with thrust bearings and adjustment spanners. They dont come in the exact right lengths though, so I had to mod the upper\lower mounts on the front, and made the rear lower mount braket hole as low as possible to fit them in, and they look pretty right on the travel. I had the guy ship USPS EMS (which is pretty safe) and mark the value low, and I wasnt hit any duty as well.
Cheers
Andrew