I haven't bought anything from them but i know some mitsu owners who recommend those two stores.

Your other alternatives are El-Dorado, ATCO, SP International.

El-Dorado - meron sa Megamall, Cubao, Paco, Pedro Gil, I can't remember the others
ATCO - Pasay, along Taft Ave. near Rotonda, http://www.atco.com.ph
SP International - from E. Rodriguez turn right to Banawe, then turn right on the first corner, kita mo na sila. (tel. no. 7120084, 7324339)

or you can contact Zildjian thru this board.