For in-store pickup only, Home Depot offers the Defiant 30-LED Lantern with Dimmer for $3.98. That's the lowest price we've ever seen for an LED lantern with a dimmer. (It's $3 under the lowest shipped price we could find today.) It provides up to 12 hours of light on four D batteries.
With these companies, it might be easier than you think to negotiate your monthly bill down.