They're hyper-rare in the United States. I could count the number I've seen, plus the one I owned, on one hand.
My friend who ran a local VW shop sold cars on the side too, he said that he had a late-model coupe wagon (yes, they made them that way) and there was a bid war on the car. As I recall he bought it for like $1000 off some old dude, ended up fixing it up a bit and turning it around for over $4000.
They had sedans, coupes, and coupe wagons in the US. It was all MKII Jetta/Golf parts underneath, but it would steal various bits and pieces from other cars. It had the transmission from the Quantum/Passat, so the engine was inline instead of longitudinal, which always threw everyone for a loop...
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And the Regal GS question?
I'd vote yes. Good sleeper car, good quality, easy to work on and cheap to fix. Can't really go wrong...