Halo 3 Cheap

Want to get Halo 3 cheaper than usual? Well this is not cheap, but sorta is at the same time. Electronics Boutique is currently running a deal where they will give you a free Halo 3 pre-order if you trade in any three old Xbox 360 games. So I took my three games and asked how much they would buy them from me for. Apparently they would only buy me three games for about AU$35. So I put them on a pre-order for Halo 3 instead which is valued at about AU$90! Bargain?