Rakuten have opened a new site (similar to play.com)
Base.com are pretty much the only sellers of anime right now however there are a few good bargains to be had if you use these codes I found.
Use either one of these codes:
LAUNCHGIFT5
LAUNCHOFFER5
LAUNCHFIVE
You can use all three codes once each per account. (£5 off a £7 spend).
I got Afro Samurai Blu-ray for £4.04, Afro Samurai resurrection Blu-ray for £5.71 and Fate/Stay night unlimited blade works Blu-ray for £9.27. I just made a new order or each item and used the code on the payment screen.
Blu-rays
DVD's
Welcome to the space show (not listed under anime for some reason)
Admittedly there isn't a lot of options but if you haven't got some of the cheaper movies (First Squad, Eureka Seven The Movie, Legend of the Millennium Dragon) they are up for grabs for just £2.82
These codes can be used on any purchase over £7 so you can get some other good deals on movies or games if they are going cheap enough to begin with.
[EDIT] It appears they only have stock of 1 of each title, all 3 of my purchases are now 'out of stock', so maybe they are can only sell 1 title at a time? or maybe its to stop me from buying multiples of them?