I don't know about dealers in your area, but here are a couple in washington state. They both sell a lot of grey market equipment in addition to north american versions. http://www.darlingsons.com/, http://www.bsrheavyequip.com/
The brands I typically see in grey market are Cat, Komatsu and Hitachi. The other place I see a lot of grey market equipment is at the Ritchie Brothers auctions. I'd say almost all of the smaller excavators and dozers are grey market machines. You also might try some google searches on "grey market equipment importers". Good luck with your search.
Well I am an import dealer but don't have a website yet. If you or anyone are interested in more information and inventory that I have please email me at darinray@snappynet.net
Allis Chalmers 416S John Deere LX280, John Deere Z225 zero turn yanmar 1401 , Oliver 550 Special, Oliver 75 Lawn Tractor, New Holland 3930 4WD, Mitsubishi BDF2 Dozer
Robert Hamilton of H&W Equipment in Dickson, TN is an excellent dealer in grey market dozers. He handles Komatsu, Mitsubishi, and Cat D3. He has several and goes through all that he buys. He also puts a good ROPS cage on them and paints them if the customer desires. His number is 1-888-265-0454 fax 615-740-9190 or615-740-8868.
I've got some Komatsu units, a D31P-20A, plus some D20A7's and D20P-7's. Very nice late model units (the oldest is 1993), and we are only a couple thousand miles from you....