Hi!
I've never seen a "real choir" for sale for home practice or even one for church use:
http://cgi.ebay.co.uk/Rodgers-538-Classical-Church-Home-Organ-/220796655047
There's also a useful analogue instrument:
http://cgi.ebay.co.uk/Viscount-DOMUS-8-CHURCH-ORGAN-Full-Pedal-Board-/170654108493
Best wishes
David P