Got mine from Oadby, Leicester Sainsburys (last one!).
The regular price (£1.99) was marked down with one of their normal 'price reduction' price stickers, i.e. it didn't look to be a Managers Special, so hopefully this isn't store specific.
Sainsburys Vouchers: Various - See Below, NA, Various - see below, £10 off 75.00 - XQXD-N3DQ-RGLM, 1.00More

Works out at £350 for the 12 months, assuming the £50 QuidCo kicks in.
However, you'll probably want the Orange £5 a month Internet package, so add another £60 for that for the 12 months. But, hey, it's supposed to be the best 3G network out there ;)
Oh, and most importantly it's IN STOCK! Beepy /
more...
Dial-A-Phone Vouchers: 10% - DISCP210, 45.00, 5% - CERV2974, 5% - DVCOUK5, 5% - CERV2974

I *think* these are 75% off - I was waiting for them to come down from reduced price of £1.25 or whatever they were last week!
