I know this sounds weird but Yuzo at UWDigital Camera in Japan has great prices and super fast service. He ships all over the world so I don't think Canada would be a problem. Just email him, he'e excellent with emails.
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mtnmn:Dee - thanks for the pointer - it looks like that setup is quite a bit more than I'm looking for, both in terms of size and cost, as I estimated their cost @ $236, not including the ball bases. 2/3 of that is still more than a brand-new fisheye tray and infinity arm - about $110 from uwdigitalcamera.com.
Regarding strobe arms, I'm inclined to go with the infinity arm - it looks simpler to use than the ULCS, etc., and my guess as to parts for a ULCS setup looks like $200 or so for a base, clamp, and 2 arm sections. Where do you buy extensions for the infinity?