Where can I get this printed?

[kaszal]

Hello, this is not strictly rc related but I thought this is the best sub-forum to ask as so many of you know about graphics and printing (mods: if there is a better area I'll be happy for it to be moved)

I want to print a 48x120cm background for a model toy diorama. Something futuristic like below. Can anyone help me with that, tell me who I should be approaching or what I should expect to pay?

Cheers!