Very nice large-ish wall maps on special at The Works, UK.
Got one some years ago, stuck it on the wall next to the sim set-up, and by now it is full of notes marking my fav airstrips, airports, country codes etc.
http://www.theworks.co.uk/p/atlases-maps/collins-world-wall-map---40inch-x-54inch/9780007843718
