Where to get glass in Calgary

[Adrenaline101]

Basically just as the title says. Looking to do some fiddling around, practise my cuts and maybe build a nano.
Anyone have any good suggestions on where to pick up 2 sheets (3'x3')of 4mm . In the South would be nice but can always make an excuse to go up north.

Sorry if this has been asked before, can't seem to use the search button on an Android.