I havent been myself, but was asking around for the same thing. Been told to head to the road Ly Nam De.

Please do post here should you happen to find one. I would like to play DVDs from my laptop to my TV - being lazy though, it just seemed easier to buy a cheap DVD player than work out this cable business...

ly nam de was a good tip and anyone else looking for this i recommend going there, i think it was number 79 that had the best selection of cables. unfortunately i have a mac and it turns out they're not so easy to find.