You could always try Geordie Pool in the UK, their address is
http://www.geordiepool.co.uk
They make 3/4 and 1pc cases and have loads of different styles to choose from.
I have one of their cases for my snooker cue and they're built solidly, cushioned on both sides so there won't be any damage to your cue at all (which being a John Parris cue I'd expect would be very important to you!).
They're really good to deal with, I've known Steve (the owner) for a few years now and he's a good egg.
Hope this helps!!