I just checked. PVC KG drainage pipe (which can even hold pressure underground) is 30 USD for a 5 meter (16.4 foot) long piece, 160 mm diameter (6.3 inch). I'll need 16 pieces (for 200 plants), so it's 480 USD total. I'm not sure how to make it cheaper with separate totes or buckets, plus the connector and drain pipes. Plus all the hassle...
