Check it out, the homepage has been redone and they are offering a discount.
http://www.vbulletin.com
Please Note: vBulletin 4.0 Forums and Publishing Suite are currently on sale at a substantial discount on a pre-sale basis. You will be able to download the latest release of vBulletin (3.8) as soon as your purchase is completed. You will be able to download the 4.0 releases of Forums and Publishing Suite as soon as they are released. These pre-sale discounts are available for a limited time only.
http://www.vbulletin.com