According to ToyFare's Guide:
G1 Scorponok; MISB = US$320 (AU$347) / Loose Mint = US$180 (AU$195)

Here are some auctions I found on eBay:
US$370 (AU$401)
US$325 (AU$352)
300GBP (530AUD)

Quote Originally Posted by canofwhoopass_87
However, to make this thread work, people should be posting standard or semi-standard current prices for particular items of interest - not the bargain prices in which they got them for. I wouldn't regard $30 for a complete chromedome to be a "What is it worth" price as it might throw off the person asking the question.
Okay, more recent example: I picked up a Brainstorm complete w/ weapons and Arcana for about $60; that was at from the Parramatta Fair (from Sherriffs Mini Cars who often have what I personally consider to be rather high prices).