The price would range from (my opinion only)
$1900 to $2500 for a machine straight out of a import container, which may need a liitle work (bulbs, rubbers,flipper kits) or could need alot of work, incl new ramps, full strip n clean, plus the stuff mentioned before and various parts here n there, this is the bottom end pricing, then range-ing up to
$4000 maximum for a very nice one in a finished shopped condition with everything very very nice and Leds fitted etc.

The last one I saw SOLD was in QLD for $3700 ish cash, it came out of a container, was from Japan and was in home use only condition, cabinet and the whole game was like new.

Notes - A dealer may ask an extra $750 on top of the stated figures, but machine may come with warranty.
Prices tend to be apx 10 - 15 percent cheaper in QLD than other states most of the time.
Can be hard to find a Whitewater with full colour in the cabinet decals from original. Most parts are avail for this title.