Just brought my Xbox360 from home (110) power supply/brick and a converter I got here gave me three flashing red lights, I assume its not enough and need something better. I read I may only need a new 220 watt power brick If this is true, how much. Any advice?

Yes, you need the 220v brick. You are lucky you didn't fry your other brick by plugging it in. The brick that works here should be about 1,100-1,500 baht depending on your bargaining skills.

on the power adapter there should be stated something about the volts.

110 v / 230 v

if the above is mentioned then you're in the clear for just another cable.

Unless you have an aftermarket power supply already, most were either 110 or 220v. It works just fine to get the 220 power supply. I bought my 220v power supply off of ebay and had it shipped to Chiang Mai for about $30. When you pick one up, make sure you get the proper model for your xbox.

Check that here:

http://support.microsoft.com/kb/907635

on the power adapter there should be stated something about the volts.

110 v / 230 v

if the above is mentioned then you're in the clear for just another cable.