I was lucky to pick one up here in Australia for $300 in the box. The same guy sold me a PF Leatherface for $300 (no box though). Couldn't believe my luck when I found them both. It's a nice piece, probably just over 1/6th scale as Bezzerkerr said, the machete is steel and very heavy for it's size. Would look nice with the right colour lighting to give it that underwater look.
$600 would be too much for me considering it's not 1/4 scale, however it depends how much you want it. These things are so hard to judge, you may find a heap of them over the next year for cheaper, or may not see another one again. This and the other Scream Scene with Freddy seem to demand a lot of money on Ebay when they come up. Good luck!