Car Hire in Queensland

Morning

I'm looking at hiring a car between Airlie Beach and Hervey Bay, with the intention of driving approx 7 hours down to Agnes Water on the first day, where we will have an overnight stop, and continuing with the remaining 3/4 hours the following morning.

I'm finding that car hire companies tend to charge somewhere in the region of $200 for a one way fee, and there are also plenty that don't offer unlimited km's.

The cheapest I've found so far is $366 that includes for unlimited km.

Does anyone know of a rental company or other comparison sites (I used discovery carhire) that might offer a cheaper alternative?

Any assistance would be appreciated.

Thanks