Well if you order from LoveFilm in the next 24 Hours you will get 10% off your order.
http://shop.lovefilm.com/lovefilm/elysium.search?search=ghostbusters
You will be able to get the PS3 or Xbox 360 version for £29.64 delivered, that's with a (£3.29 discount).
You will also be able to get the Wii version for £26.94 delivered, that's with a (£2.99 discount)
Use the Code Lovefilm25 at the checkout to get the discount.
When you press the Pre-Order button the item appears in your basket on the right, under that you will see the box you have to enter your discount code in to.
You can use this code as many times as you like and on anything else you may want like DVD's, Blu-Ray's or games, you only have to make sure your order is over £25 to qualify for the discount.
I have used the website many times with no problems, and on 3 occasions I got the goods before the official release date.