Agreed, they are out there for sure.
My Quicksilver was purchased last summer from a very cool Pinhead who had never even heard of Pinside! It was in his basement arcade for at least 15 years. When he finally posted the machine on Kijiji I somehow managed to respond first.
It's a great game but to be honest, my 1977 Stern "Pinball" is just a bit more fun. So if I had to pick just one, it would be the 1977 Stern Pinball. But I'm partial to chimes and very short ball times