Do not buy the bot from 3rd party websites. Just PM Gunthar directly with the ref. code of your choosing: https://bitcointalk.org/index.php?action=pm;sa=send;u=817682.
Thanks for all the help on this forum, ordering Gunbot using your reference code 
Does it still not support bittrex?
It does support Bittrex and has been working on it for quite some time.