Hi, came across this in a Morrisons store this evening in South Wales.
They had a few copies left, along with a Schwarzenegger box set for the same price.
It features all 4 original 'Alien' films, as well as discs packed with over 40 hours special features, including original and extended cuts of all films spread over 9 discs.
There are other deals on here, including one posted a few days ago which says it is £8.95 at Zavvi, but this is good if you don't shop online or don't want to wait for delivery.
I assume it's nationwide, and it's a brilliant box set.
£9.99 at Play
£9.98 at Amazon
This was in the full packaging as well, not the 'Slimline' box.