while people will ask all sorts of money for them, 1500.00 would be tops for one set up and playing. they usually seem to go for 800 to 1100 needing work and 1100 to 1500 set up and playing...
they are more or less the same as the supers but with a different octave mechanism, no pants guard, usually no side f sharp guard, and a different tenon receiver... also they do not always have a front F..
they can play quite well, i had one form aroudn there that was one of the best sounding altos i have ever played.. unfortunately, the ergos were not so swell.