for a 12 slot rack yoou will need

2 sheets of melamine $36 each
1 box of screws $4
1 tube of caulk (optional) $3
10ft of 11" flexwatt $50 (ebay)
2 flexwatt connectors $3.95 (ebay)
1 power cord $1
Hydrofarm thermostat $35 (ebay)

Total $168.95