I don't know but there was one on preloved for ages and I dithered over it for too long- when I finally messaged today having decided it was too good a bargain to miss out on, someone beat me to it just a few days ago. Gutted isn't the word!
I have an arc, the horses love it, both in rain and hot sun they use it all the time. It’s easy to tow around if you need to move it. It does leak a little through the knotholes in the wood but not a big issue. My only worry was if one non dominant pony gets stuck with a bossy one at each end, but with my current herd dynamic it’s not an issue. Biggest downside is the metal braces, potential for banging into them whilst playing around the shelter.