DIY can be an order of magnitude cheaper.
I made mine with spare plywood I had laying around. Added an optional clear side so I could see it in action, but the thin Polycarbonate sheet wasn’t that expensive either.
It takes a bit of work (not too bad), but if price is a consideration, this can be much more attractive than a ~$200 off the shelf option
I’ve been using this setup for more than a year and the separation is great.