the only one I could find out about,is the Generalmusic sk788
http://www.generalmusic.com/prodotti.asp?cod=995175&lingua=ita&frame=ca

anything else? Probably not too many people use these,because they are so darn heavy...

but I guess it's ok if you keep one in the studio and you practice piano.
Does anybody knows some other models by Yamaha,etc?