Various options in Collie from camping to motels are listed at
https://collierivervalley.com.au/where-to-stay
The mapper often stayed at and recommends https://blackdiamondlodge.com.au/ for those that don’t mind a shared bathroom.
The upmarket option is https://www.collieridgeresort.com.au/
Bunbury is a large regional city 56km west of Collie with extensive options.