I had a lot of the materials on hand from other projects, so it's hard to say exactly. Turbine, tower, inverter, controls and all the misc. I have probably about $6,000 in it. $3,600 of which is the inverter. I'm a fabricator for a living, so I get some pretty good deals on most of the materials and had all the equipment. If some one went out and bought all the parts I would guess it would be close to $10,000.
I'm doing it for fun and as long as I don't go broke I don't mind spending some money.