As of now I don't know of any webshops that have this release in-stock. So while you could try www.frs.nl or www.bol.com - I cannot give you any guarantee you will receive the right version. In any case, they still seem to have it up for 'pre-order'. Within a few days I can probably tell you which webshop are 'safe' to order from.
Apparently Universal had a problem producing the new steelbooks for this release, so they re-released the old steelbook artwork with an additional sticker for this remastered release. To make things even more confusing, Universal will be updating the steelbook to the intended artwork somewhere in august.
I bought the disc for 13 euro at my local Media Markt. I hope I haven't given you all the impression that this will be the general price. You will probably pay somewhere around 20 euros (excluding shipping) when buying from a webshop.
Oh and yes, it also contains the extended cut.