US size electrical parts (wall boxes)

Hi,

A bit of a long shot, but…

Does anyone know anywhere in Taipei (or Taiwan) which sells US sized electrical parts?
I am looking for wall boxes (or back boxes), which you embed in the wall and then screw the light switch to. The box holds the wiring and connections.

I’m having a couple of special timer switches installed (I brought from the US) but I forgot to bring the US size back boxes, so it would be very useful if I can pick some up in Taiwan instead. Has anyone else found these type of supplies in Taiwan (Taipei)?

Thanks for any help!

Ben