Those are likely custom made. You can mimic this by using square-ish containers and rotating each new one by 45 degrees. It wont get you as many plants per stack, but it's at least a start and likely less expensive.
it may require a bit of work to get them to stack properly, but should meet the same purpose. That, or you could just go get a bunch of plastic cups and set them up how you like! I'm sure with a wooden frame they'd look about the same.
95% because I don't see this exact type on their website. But I think I saw this type on every expo they've been to in the last couple of years. They should be at Agritunity 2013 next weekend, so I can make sure if you're still looking.
Where did you find the supplier? Looks really cool that stuff! Using the vertical space makes so much sense! Ok, lots of plastic there too, but hey, that could lead to really much higher yields!
samples I got from Stackingplanters.com they have a small water reservoir in the bottom of each pot. I have a back injury, so I belive they will work out perfectly for my application.
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