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Growdan 1.5 inch rock wool cubes, 45 per package.  $13.55 at Amazon.

2 inch net cups, 50 pack.  $9.47 at Amazon.

The shop light ($50), four T8 cool white lamps ($15 total), PVC pipe/fittings, hangar chain and eye bolts from Home Depot and Lowes cost me $103.