You have a few choices.
1. Trry to get old used. Your s the newer 4 hole model? There are plenty of them around. Better if u come across a front torsion beam, buy the complete set...should be less than 500 bucks. You get everything.
Take this apportunity to redo your other braking components.
2. Upgrade to disc brakes. New drums already cost you rm500 ++ plus labour and you still end upp wtih drum brakes.
3. I donr advise buying new because they are all made in Brazil or Mexico. Quality sucks big time. I am not surprised they get warped after a few months of usage.
good luck.