The Canon 20Da (astrophotography model) was launched in the US last week..till now it has only been officially available in Japan. No prices were announced-some dealers were taking orders at $2100 (US) tentatively..could even be priced at $2400 or so.
These babies are not cheap.
There are some other options, that may be worth considering
the new SAC 10-yet to ship , though orders are being taken-looks like pretty good value (US $999)
Also Atik (
www.perseu.pt) have launched a single shot colour CCD , Peltier cooled at Euro 1799. Of course you would need a guide camera and scope with these.