This is comfortably the cheapest price available at the moment and we wouldn't expect it to drop much (if at all) at launch. Most other sites are taking orders for £50-£55. Hell, Argos are trying to mug people for £70.99! I'd imagine the Red and Blue models will rise in price first, so it may be worth acting on this quick if you're going to need a second controller. Let's face it, the USB charging lead bundled with the console isn't going to be long enough to charge while you play is it? So it makes sense to have two controllers.
Thanks to chicodudi85 at HotUkDeals.