I used eForex a few days back, its a money exchange app. I bought my currencies with the app and picked it up at a Merchantrade outlet near my house, rates are good and they even have a cash back promotion now.

You could even try going to their branches, they have one in almost every corner in the klang valley.
Check it out: https://www.mtradeasia.com/Home/Outlets

or you could message them on FB, they're pretty responsive https://www.facebook.com/mtradeasia/

looking to buy korean won penang/ipoh...

or do you guys know where the best rate money exchange in penang?