I was in Maplins (Gallaghers, Coventry) yesterday shopping for a hard drive, when I came across this deal for a 3 USB Mobile Broadband 12GB Starter Pack
I remember seeing this post from johnatcastle last month and thought it may be of interest:http://www.hotukdeals.com/deals/3-mobile-broadband-dongle-with-12gb/777274
This seems to be instore only. The website has this item, but it appears to be out of stock. Could be worth a phone call to your local Maplin if you're interested.
There are some vouchers and quidco for Maplins floating about also.