I have no idea about Australia ... but here in the states I have noticed on E-bay that the prices on good 99's are going up and up. Seems like every time I see one I like it sells for well over $150. I *personally* am not willing to pay that much so I'm biding my time and waiting for a good one at a good price.
The most important question though is what is it worth to YOU?? There are machines that I've paid more than other people would be willing to pay, but I wanted them ... a lot