First time deal.
This is a Today Only deal at Scan (http://www.scan.co.uk/TodayOnly/Index.aspx) so please make sure you go via the Today Only page to get this price.
Free delivery is available to those who have sufficient posts on the Hexus.net forums and/or have activated any other free postage offers.http://forums.hexus.net/scan-care-hexus/138836-scan2hexus-free-shipping-setup-guide.html
This is the Asus 5850 which comes with bios that allows for voltage tweaks and overclocking without voiding the 3 year warranty.
Normal link on Scan's site: http://www.scan.co.uk/product.aspx?ProductId=31051
Yes you can buy a cheaper ATI 5850 and flash it with the Asus bios but you would then potentially loose the manufacturer's warranty (2yr's on most other cards).