While one or two retailers in each country are offering early demo access and an exclusive in-game Tenacious D guitar, it looks like Best Buy is going to stir things up a bit by offering its own exclusive offer: a Brutal Legend-themed LP case just like you — or at least your dad — remember from the classic days of metal.
There’s no word on whether or not the LP case will make its way to retailers outside the US, but I think it’s fair to speculate that at least one vendor in each region will be offering these. If I were to put my money on which European shop will get it, I’d say Play.com.
Currently Best Buy’s Brutal Legend section says nothing about this bonus, so it may be that you have to go into Best Buy and order from the shop itself to get the bonus. If anyone has further information on this please leave a comment.