This is the DUO version and is only about £5 more expensive than the SOLO version (available at this link http://www.gear4music.com/Recording-and-Computers/Universal-Audio-Apollo-Twin-Solo-Thunderbolt-Audio-Interface/X5T).
I think it usually retails at about £600-700.
You can also get 2 Universal Audio plugins free if the device is registered before 31st December. It does say estimated delivery on 16th January so I don't know if that will be possible but I might email to find out if there's anyway to still get the free plugins.
Doesn't include the thunderbolt cable, does includes free delivery.