BuyDig via eBay offers the Sunforce Stainless Steel Solar Ventilator, model no. 81300, for $48.99 with free shipping. That's the lowest total price we could find by $5. This weatherproof ventilator purportedly freshens air and reduces condensation. Features include a stainless steel cowl, solar option for daytime usage, on/off switch, and a 92-lumens light.