Want to buy used 16 to 20 seater mini bus - Mumbai - traveller tempo

I am looking to buy a mini bus with 16 to 20 push back seats, dual A/c, properly loaded, in good condition at a reasonable price. Private registration with all other standard fittings preferred. Private parties and dealers welcome to respond. One of the models I am interested in is the larger Tempo Traveler with an original Mercedes engine, but other options can also be considered.