Target offers the Holmes Dual Blade Twin Window Fan for $17.99. Choose in-store pickup to drop it to $16.19. That's $2 under our mention from three weeks ago and the lowest price we could find by $7, excluding the mentions below. It features twin 6" blades, adjustable extender screen, extender panel, and two speed settings.

Close prices: Walmart and Amazon have it for $17.99 with free in-store pickup and free Prime shipping, respectively.