Pinpedia shows mixed results..

http://www.pinpedia.com/machine/458/prices?c=au

They are in USD too.

I guess for one in full working condition with no playfield wear would be upwards of $2,000.

Last one I saw in VGC had a fantastic playfield.  I suspect that went close to the $3k mark.  I think a member here from Brissy (BrissyGuy maybe) is selling one which looks very nice and has topper and speaker/sub upgrades and I think he was asking around the $2850 mark.