>>38414534x5 is a terrible choice for handheld because it's more expensive and fiddly, less flexible, and motion blur negates any resolution advantage.
There's a reason 4x5 fell out of favor for pretty much any handheld work as soon as enlargement was common practice.
But here are some links:
https://www.cameradactyl.com/buttergrip/cameradactyl-og-4x5-hand-camera nice and cheap, looks like a 4x5 lomo.
http://www.fotoman.cc/showPro.asp?id=26http://www.aubreykingston.com/lfcThis trend seems to be kind of 'hip' right now, so you have a lot of choices. See for yourself.