I'm often looking for stuff/materials that are niche or difficult to find.
and started this thread.

I'm currently looking for the heavy non-corrugated cardboard (4mm thick maybe) for a board game idea and to try some simple modelling (could also use it in the classroom). But i cant find it anywhere.

officeworks may have it but i was hoping that i could buy it in sheets from a supplier or business that regularly uses it, or even beg their offcuts.

the card is the type on the back of large drawing pads. relatively rigid.

ideas?