Hi Gregory,
welcome to Dumagueteinfo, several shops sell second hand books, Lee Plaza is one of them. sure not the size of SM one but OK
If you are in Dumaguete and have a drink or two at
Mikes Adventurediveshop, have a look at his book exchange-rack. bring one of yours, and take another, Not the biggest choice, but enough to spend a couple of weeks reading...
Rhoody