I got my unit back in August last year but I don't recall paying any Customs or import tax.
I think you're allowed to purchase items over the internet to the value of AU$1000 before they charge you import tax and customs fees.
I see the current iLiad worked out to be just over AU$1000 but you have to be very unlucky to be taxed on that and over $200 that's a bit much (Customs Xmas fund
Did you purchase any other accessories which bumped up the price ?
The actual shipping time is quiet fast from UPS about 3 days but the delay is with iRex processing your order.