I've been unable to track it down in major supermarkets/grocers here in Australia, but the occasional Asian supermarket sells it (and sometimes knockoffs)
As far as the name Sriracha hot sauce is concerned, that is actually the original original. They used to bottled it differently but have changed to this squeeze bottle just recently, probably to compete with the rooster brand.
You can easily tell which are the knockoffs - http://www.foodrepublic.com/2013/01/17/how-spot-fake-srirach...