The truth be known the cost of material and manufacturing is very little but you pay a high price for global capitalism(wages/tax,overheads,profits, consultants, CEO's{so much for trying to fix the ressesion when theres still CEOs and people at the top who get paid $100-$1000 an hour for sitting on there ass doin nothing}, etc.). Anything to do with so called free energy will cost you alot more in order to make you wait 5-20years to get the return and start receiving free energy and by that time its too late unless you take it upon yourself(BIY).