Yes. we have many buses travelling from Alor Star to Penang. It is every 3 hrs. the fare cost u around RM17 per way.
According to Google Maps, there are 105 kilometres between Penang and Alor Setar.
You purchase bus tickets from terminals/stations/kiosks offering them.
1 hour moderate driving
it depends where you live.
Much less than a bus ticket is today... Of that you can be sure! (Note: there are no archives to research in reference to bus fares earlier than 2005)