Pretty cheap Flip mount I just found!
 

PRISMS PEOPLE!!!
GAH!!!!!

http://www.youtube.com/watch?v=nyVOHGT559E

anyway, i've spent some time looking for some relatively cheap prisms. i found this:
http://www.indigo.com/science-suppli...gle-prism.html

either way if it's 50mm or 55mm it's still too small

i checked for 60mm (which is how big the viewfinder is)prisms and i only found them for around $100.
not really worth it.

enjoy!