Actually, next to GAME, Gameplay and Shopto.net you can also pre-order it at zavvi or TheHut :
http://www.zavvi.com/elysium.search?...rch=dark+souls
http://www.thehut.com/elysium.search?search=dark+souls
If you are spending for at least £50 at Thehut you can get a £5 discount when using the code 'MMD50' for a limited time.
And yes it also works with pre-orders because I used it for pre-ordering Dark Souls LE (it's called SE here but it's the same if you check the picture) and Ace Combat Assault Horizon LE.
I also believe their shipping rates are lower than Shopto.net of GAME, nl. £0.99/item for Europe.
Only problem is they can be a little slower with the shipping.