I order deli containers on ebay or use clear, plastic drinking cups, then drill the holes myself with a hand drill. You can also heat up a phillips head screwdriver and punch the holds through it.
32oz deli containers work well for larger plants (but not huge). They are about 5'' in diameter. The 16oz and drinking cups work well for smaller plants and seedlings.
For my LECA, I order on Amazon. If you have a hydroponics store near you, you can get it there are well.
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