I am Jags from India. What is the cheapest mode of transport to go to macau from hong kong.

It is cheapest and most covenient to travel by ferry. The ferries can be taken at China Ferry Teminal and HK-Macau Ferry Terminal. These ferries are operated by Turbojet and Cotai Water Jet companies. By contrast, latter (Cotai) charges a little less, HKD141-175 per person.