OBD code readers
 

I just used a Autel code reader for my car and it only gave a generic code of P1727. I understand it may be a transmission code being shown. What BMW code readers are available on the market without a silly price tag, since this is not used very frequently, I hope.
Read there is a INPA software package for the pc, what else is there that can read BMW codes.
Any suggestions is appreciated.

Thanks.
Nelson.