2 cycle oil for outboards in BKK near BTS or MRT?

[impulse]

Just bought a small Yamaha 2 stroke outboard and need some oil.

Interweb searching the blogs, I decided not to opt for the TC grade they sell everywhere for motorcycles because it's for air cooled engines that run hotter than a water cooled outboard. I'm now looking for TCW-3. I'd also like to find a boat shop in BKK just because I like perusing boat shops. And I'd like to buy a spare prop, and maybe even a rowboat to go with the motor.

I know I can head off to Pattaya or Jomtien and find what I want, but I'd prefer to start cultivating a relationship with a shop nearby.

Suggestions? GPS coordinates or web address would be much appreciated. I'm around Asoke, but I do have wheels that I can fire up (only) for a worthwhile destination.