Cycling to Work in India, since this new year. No gears.
Basic cycle + 3 locks + Air pump = $90USD. 15Kilometers.
Already saved $20USD/ month.
Never going back to Automobiles again. My friends are also trying to start biking to commute after I've made it. Many thought I'd go back to MotorBike after 1 week but I persevered and it's a joy riding the bike.
Highly recommend to people in Indian Metro, just add 10 minutes to average 7km commute. Happy riding !