Greenhouses

Im looking for a large popup greenhouse and for some reason most of the large ones are green! Is there a difference between green and white greenhouses? Also does anyone know any good places to get a large, heavy duty but affordable and semi temporary greenhouse? I live in canada and free shipping is a must.
So far ive checked out walmart, home depot, amazon, and wayfair.ca.

Uncle wiener has some greenhouses. No idea how good they are but look like they would grow things.

I'd recommend building one yourself, tends to be cheaper and more durable in my experience.

I just built a 10x16 greenhouse with visqueen and 2x4s. Including fans, cooling, and building materials it set me back ~$500. The fans cost as much as the materials, ~$220

Green shades on a greenhouse covering limits some intensity from the sun, allowing seedlings and other plants with lower DLI needs to not bake. It is green because plants use green wavelengths the least, but it still cuts down on exposure.

If the greenhouse is for cannabis or other high DLI need plants, go with a clear covering.