In the US it is sold in the lighting department at Home Depot - the folks at home depot usually don't know what you mean when you say egg crate. It's not cheap. I was originally going to build all my dart frog tanks with it but frankly it's rather unsightly and I ended up just using it for temporary housing and for raising dart frog tadpoles and such. I much prefer LECA and other similar materials (like featherlite which Black Jungle sells). However, the plastic egg crate is the lightest material of all of these so there is a trade off. If you can find black plastic egg crate, that would be ideal but it's very hard to come by and HD doesn't sell it in black, just white.