Here in the UK ,if you want to do the mechanical switch version, of the pc engine region mod ,finding those 8PDT switches proves impossible .But i found an easy source of them by accident.I had bought a fully wired ,scart switch box and i intended to put the lm1881 sync stripper inside the thing.So i opened the bugger up and found that it uses those impossible to find 8PDT switches ,as it's scart selector source switch.
You can get these in switchers in 4/5 and other versions and they're cheap as chips for canibalising the parts needed.
(http://i.ebayimg.com/00/$(KGrHqMOKpgE0VR2CW)GBNW+,NTKzg~~_12.JPG)
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=280631159360&ssPageName=STRK:MEWNX:IT (http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=280631159360&ssPageName=STRK:MEWNX:IT)