I`m from manila so i get everything here. I believe i got my struts from FERNANDOS auto supply on aurora blvd (because it was a bit cheaper than the other stores i checked with). They`re listed in the yellow pages btw. They do cost new P3200-P3500 / piece. If you pm me your email address i will gladly send you a list of aftermarket/replacement suzuki suppliers in metro manila.
Or if you prefer to see the list i got it from, then get on the TSIKOT.YEHEY website and go to the Suzuki Forum and find and click on "Suzuki Esteem Wagon merged" (lots of info on locally available parts new and surplus and reconditioning), see p.11 for the list of stores.
It says that surplus struts from Evangelista st , Quiapo and Banawe st, Q.C. go for P800-P1.2k. I decided to have mine reconditioned at ZEE CARPLUS (check they`re website) for about P800/pc. Also try CRUVEN (also with a nice website) for reconditioning.