Glass for DIY sump

[Mork]

I thought I would have a crack at building my own sump. Funds are a bit tight at the moment, and I'd like to experiment with a few configurations.

Could anybody point me in the direction of a cheap plate glass supplier? I'm assuming that Home Depot don't sell panes?

If anybody has any 1/4" sheets kicking around from a previous project - I'll take it off your hands.

Cheers