The mold thing is really sad. We had a super wet and humid summer so I added a fan to my setup.
I let the branch with the seeds live to let them finish up.
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Set up cost (fixed costs)
-Lamp: 40€
-Timer: 3,5€
-Pot: 4€
-Total fixed costs: 47,5€
Given 5 years (or 15 grows) usage time translates to around 3,17€ per grow in materials.
Variable costs:
-Seeds: 3,17€
-Soil: 6€
-Fertilizer: 3,50€
-Power (100 days 18h/day): ~25,92€ (exact figure after harvest)
-Total variable costs: ~38,59€
-Total costs per grow: ~41,76€