@the_gabo yes some store depleted their stocks already but twice in a week they replenished might be S4 or other device. What you can do is apply now then if there will be no available handset they will call or sms you. Take it as reservation. Hotline processing can reach 1 Week to a Month.
These is Due to the surge on demand.
If you had ample of time you may try inquiring through different Globe Buss.Center and find your luck. wahaha!