I came across a pinhole camera on eBay that I had not seen before. Just was wondering if anyone had one. It seems to be from Perth Australia. They claim to have a "quick change optic" . Anyway the eBay item # is Item #1201766707 if you want to take a look at it and maybe this link will get you there:
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1201766707 Max Oklahoma