Yup, Carrefour, Beach Rd Army supplies as well as climbing and outfitters stores. There's one around the camera Mecca at Capotol Building, but they deal in quality gear, so expect non-lelong prices. Also, some stores like the one that TSers go to for their flash-light desires might have. Othe options, if all those dun have are rehab suppliers.
All the best in your search!