go Facebook find this guy : Kamerami Lovefilms

which area are you in? 35mm film still can easily be found in normal camera shop.

try search those older camera shop as well, sometimes you might find some special films there.

can I know what camera are you using?

Last time i bought mine at these places below, just to share with you.

1. E-Six at Pudu plaza
2. The Click Shop at Pavillion

There is a shop in Central Market forget what is the name edy, near to the center exit door. Still can get fresh one at great variety.

Another i recommend is The click shop, pavillion as recommended by lizardlim, can find a few rare 35mm film, such as Solaris FG plus film from ferrania, great wash out feel from the film. Join their shootout event, very friendly shooter, they exchange film and reshoot the used film to get double exposure 

or go Garage sale look for cire_ark, has a shop near to KLCC (aquaria KLCC area). I tarpau a bunch of expired film at a very good price, turn out the quality is still good.
Sample,