There certainly are in the UK
I think they are called 'dealer plates' in the US. They are very handy, whenever we put an unregistered car into the showroom it must be brought up on these plates.
Also, all used cars don't have road tax so these plates should be used. They cover insurance, tax and MoT. The insurance only covers you between the plates, on a 911/Boxster it is very difficult to attach them under the luggage compartment cover so we used to put them on the dash. They usually slipped off under acceleration; I suppose this meant that the car forward of the footwells was not covered by our insurance?
I've also had one come off the back at 120mph and rip itself to pieces, probably run over by other traffic, I hope, if you foind some, they aren't attached by rubber leads, some are magnetis but this is a problem when your bumper is polyurethane and your bonnet/luggage cover is Aluminium... I suppose don't break the law....
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