Usually this sells for around $120 on Amazon and similar prices elsewhere. Currently it's $130 at gameology, $144 at Goodgames and $130 at the Gamesmen. However, there's an Australia seller on eBay that for a long now has consistently sold it for $100 shipped.
Overall, to my mind, not a fantastic discount but still probably the cheapest it's ever been offered new. On Amazon it's been hovering around this price, give or take a few dollars, for about a month now.