Would you be interested in purchasing a used one? I have a like-new Kelty backpack that I'm no longer using. I had it shipped over from the States, but my daughter wasn't keen and preferred riding in a sling for our hikes. E-mail me if you're interested.
Alternatively, eBabyasia (they have a website and are also located in Forum office tower) carries a few Tough Traveler models if you'd like to check them out.