Omega Sentinel - Advice wanted on buying price

Hi folks.

Been looking up some toys for my "want list". Please note I am not in a position to buy this toy right now, so that is why I am posting here and NOT in the "toy want / buy section".

What I would like to know is what is a fair / going price for Omega Sentinel, boxed or unboxed, don't want to overpay for one when I do get it. I've seen them listed for anything from $150-600 AU, so would like to know from fans/collectors, what is fair and decent price to buy one complete second hand (as in complete toy) but I don't care about the box or instructions, just the toy.

Thanks, much appreciated.

I don't own the toy and am not an expert in its market value. Having said that, Transformerland has their estimate of its market value (in USD) at the following link.

http://www.transformerland.com/price...Omega_Sentinel

This might be a good start but I would also expect more informed opinions from others here.

Just a friendly reminder for future reference that there's this sticky thread for asking about what toys are worth. :) :D