I haven't seen any shops in Scotland myself so I asked the forum for advice as well, Your best bet is problery one of these sites if you don't mind your neo geo arriving by post...
<a href="http://www.videogameimports.com/" target="_blank">http://www.videogameimports.com/</a>
<a href="http://www.cex.co.uk/" target="_blank">http://www.cex.co.uk/</a> (not a porn site don't worry)
These places do unboxed neo geos for £150
or failing that you can buy a neo geo from telegames like I am going to do by phoning them, they do a neo geo with a game from £175 0r with an extra game of their selection for £15-20 but I have heard unless you ask them the right questions they give a crap joystick or scabby console from other users of this forum so be as much a pain in the arse as possiable when making your order so you get a good deal at the end of it.