Egg Crates

[YEGReef]

Noticed a lot of members use Egg Crates in their sumps for separation, just wondering where you guys are buying them.

Located in Edmonton if I could purchase somewhere local but online works as well.

The only place I found was HomeDepot and a somewhat medium piece was close to $20, thought that was a bit pricey, or is that the typical cost?

Or if you have a similar alternative?

Thank you