Well seeing as I could get Shadows Evo X one for AU$550, I'd be looking to pay around AU$150 for a VRX spoiler, espec as I would have to get it painted as well.
I think you'll probably not find anyone willing to buy it unless you lower your price a fair bit, but hey he is welcome to try and sell it for whatever he wants.
dealers are crooks. The spolier i have isnt a VRX one, and its not a lip, its like halfway lol, anyway, i paid 550 for that. 600 is a bit steep for something that isnt brand new. 250-300 at the most