i picked one up in christchurch when i was there last. booked it the night before i arrived, no problem. great option, cheaper than taxis and more convenient!
I can imagine there would be a high demand though - none of the other companies appear to have a comparable price/option (unless you go off-airport which is a hassle in itself).
Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly
to your computer or smartphone by using a feed reader.