Can anyone recommend a shop that sells beard trimmers?

My one is a dead parrot

Lazada   cash on delivery  lots to choose from ....I use lazada  as my go to shop ..saved a fortune over the years . don.t even have to leave my arm chair or the comfort of my home ?   win win 

If you are handy it might just be the brushes. Worth 30 mins with a screw driver. 

 

Or it might be lack of lubricant or clogged with hair.

You could try here:  https://goo.gl/maps/6Z1cxZT8nku

that's where the local Barber shops get their supplies from

 

They also have a smaller branch opposite Big C Extra

Location: https://goo.gl/maps/Zf7uxqSt1ov

Any big department store should have them in the same section as shavers. I bought a Phillips brand multi purpose set, which works well.