Hey Gav
I currently have a "roller" stored at the Car Kennel in Melbourne, cost is $200 plus gst per month, paid 3 months in advance. Additional charges for loading / unloading but at least they seem to have the resources to do it appropriately. Also seems to have contacts with towies (as i guess you would in that game) if and when cars need moving...
Probably no new information but supports the numbers you initially indicated.
Good luck, as others have said, I don't suspect there will be any better time than today.
David