TweetyPot (my 29er) is up and about again after two weeks.
Fortunately, Gravity Works in Makati City has two available tubes. On my way to the bikeshop, another luck struck. A biking buddy, Dennis Castillo, called up informing that there are four available tubes at JBL. I was glad he did me a favor by reserving the tubes. Thanks Papa Denz.
Now, TweetyPot has five spare tubes. But, two more bike shops have run out of stocks.