Used Mac Pro's in Canada

I am wondering where to buy a good quality Mac Pro of recent vintage (2009/10/11) something with more "oomph" to it-a single Quadruple-core Mac pro just doesn't really cut the mustard any more and I know that my local Apple Store only deals with the latest stuff. I'd try westworld but that"s the only other place I know of

Thanks

John b

via ehMac.ca http://ift.tt/1xYZncT