There is the Pyxis for $1500 or the combined adaptive optics/derotator for $1999. Johannes gets good results with software derotation here
http://homepages.uni-tuebingen.de/jo....brachtendorf/
It may be possible to use bartels system and build your own if you are more clever than me, and save some $$
http://www.bbastrodesigns.com/BBAstr...RotatorFocuser