I got an email today from seagate saying they are offering £15 cashback on their (recently reduced) 2TB home NAS through a variety of retailers, although the only link in the email (provided) is for play, so you may be able to shop about and find it cheaper. nothing about the added cashback on amazon though.
Also available is a 1TB one for £83 after a tenner's cashback.
I searched on here and this appears to be a very good price for NAS systems, ideal for sharing music, videos and pics, etc between computers, printers and so on.
The downside appears to be that you can't organise things into folders and sub folders on it; you can only dump things straight onto it, but some people won't mind if they're just using it for music and videos.
my first deal so be kind (& hopefully not a repost)