I am dead honest. Google Phantip Plaza (where Zest has one of their store fronts). It is an enormous mall that is notorious for pirated software and is a matter of dispute in Thai/US trade relations. I bought a copy of HL2 from Zest at Phantip only to discover that whenever I resumed the game, the environments were unresponsive - which is something Valve put in the game to combat piracy. Plus, any actual legal copies produced for the Thai market are not for export. Buying them from SE Asia via the internet is still undermining the economics of the industry and cheating the developers (I don't proclaim my own innocence). If you are ever in Bangkok, I recommend you skip Phantip and check out the areas of Patpong, Nana, and Soi Cowboy. Much more interesting. And yes, any story about Bangkok bars that you have heard is probably true.