Any of you weenies know where I can find a roll of plastic material similar to what they use in these airpot planters? I know there's dimpled drainage products out there.
The closest I could find from a box store was from Menards.
https://www.menards.com/main/building-materials/insulation/foundation-insulation-coatings/superseal-5-0-x-65-6-dimpled-foundation-membrane/sm50150/p-1444444226423.htm
Yeah, I'd have to drill my own holes, but I'd save a lot of money and could make the pots whatever size I want. Something with holes already in it would be even better.