Walmart offers the Lasko Multi-Purpose Pivoting Utility Fan, model no. U12100, for $49.92 with free shipping. That's the lowest total price we could find by $5. It features a pivoting blower head, on-board circuit breaker, and two 120-volt grounded outlets.
Walmart offers the Lasko 3-Speed 16" Oscillating Stand Fan in Black, model no. 2521, for $21.19. Opt for in-store pickup to dodge the $4.97 shipping fee. (Target via eBay offers it for the same price with free shipping). That's the lowest total price we could find by $10. It features a tilt head and adjustable height.
Home Depot offers the Lasko 8" Electrically-Reversible Twin Window Fan, model no. 2138, for $49.99 with free shipping. (Amazon charges the same.) That's the lowest total price we could find by $2, although most retailers charge at least $55. It features an adjustable thermostat, automatic control, fused safety plug, and independent motor control. It fits windows from 25" to 35" wide.