The new release Stardust Dvd is only £9 instore at Tesco for just one week. I've not actually been in to see it for myself, but there was a big poster outside which didn't appear to have any smallprint (when you spend £50 etc.)
I know it may be as cheap or cheaper in some other supermarkets, but at least by posting this somebody might let me know!
I also know that some people aren't happy about buying these vastly discounted products (Dvd's, Books etc) at supermarkets, but to be honest, it's the only place in my town that'll be selling it!
It also claims to be the same price online (see link) but when you click through, it's more expensive - maybe they havn't updated the price yet!