Yes, Tata Nano CNG LX is available in almost all the major metropolitan cities in India. To confirm its availability by contacting the local Tata dealer in bangalore, kindly visit the below link: -
New Tata Nano with EasyShift is available at Rs. 2 lac (Ex-showroom, Delhi), and the final cost depends on the valuation of your car. So, first get the valuation of your car from authorized Tata dealer, so he can give you a final quote for the new car.