I know it's not the cheapest it's ever been (by about 40p), but it's the cheapest that it is now from what I can see, by a good few pounds.
And £6.85 for a classic to add to your blu-ray collection doesn't seem too bad :)
It's been so long since I last saw it, so I can't remember the specifics. But it has an 8.1 on IMDB with over 100,000 votes, which is usually a pretty good sign.
(Don't forget Quidco/Walkers codes, etc., etc.)
"ROBERT DE NIRO, SHARON STONE and JOE PESCI star in director MARTIN SCORSESE's riveting look at how blind ambition, white-hot passion and 24-karat greed toppled an empire. Las Vegas 1973 is the setting for this fact-based story about the Mob's multi-million dollar casino operation - where fortunes and lives were made and lost with a roll of the dice."