They aren't that rare! Lets face it, this forum, autotrader, pistonheads and ebay is all you ever need and most of the cars appear on all three of the latter. Do you really think a dealer is going to bother checking for you each day, just do it yourself and be ready to pounce on a good one.
I've missed out on two decent Zeds, a little unfortunate. So ever little helps. Fancy selling me yours?
You can buy the wheels