g'day

I will soon be traveling to koh tao to do some diving for a few months and will be taking a small netbook with me as space is at a premium in my very small bag. It doesnt have a dvd player/reader thing so I will need to buy an external reader to view dvd's required for the course I am undertaking.

Does anyone know if these sort of devices are available to purchase on koh tao? Or will I need to get one before arriving on the island?

cheers,

princess