I have one of those baskets - made of cane - and I am almost certain I got it from King Arthur, though it was a great many years ago. I just did a bit of googling and found this
http://www.basicingredie...og/index.php?cPath=64_96
I have never done business with this website - after all it is so far away from me here in Massachussetts, USA - but they are in Australia and they do seem to carry what you need. If memory serves, the Australian dollar is a bit more expensive than the US dollar, so the prices seem somewhat higher than what I would pay for a banneton here. On the other hand, they are not exactly cheap anyway, and they last a long, long time. I hope this helps.
PinchOfSalt
P.S. If you live near a traditional bakery, you might try making friends and asking if they will sell you what they need. You never know.