Northern Tool offers the SolarSheat 1000GS Solar Fan Assembly for $899.99. Coupon code "255830" cuts it to $879.99. With $65.49 for shipping, that's $420 off list and tied with yesterday's expired mention as the lowest price we could find. It features a 1,000-watt solar thermal air collector, duct kit, wall mounts, thermostat, and fan assembly with 15-watt PV panel.