Garmin Asia US Garmin GPS For Southeast Asia?

US Garmin GPS for Southeast Asia? - garmin asia

I am in the United States. However, I would be a Garmin GPS, which works for the United States and Southeast Asian countries like Malaysia, Singapore, Thailand, etc, because I travel a lot. Can someone tell me what kind of GPS model, and allows, where to get the best price, such as Wal Mart, Circuit City, Best Buy or HH Gregg, perhaps? Help or a link to a web page. Thank you.