You can get semi free standing baths for smaller areas - still looks like a freestanding but taps will be cheaper and you have somewhere to put your shampoe / drink etc....
expensive though
http://www.bunnings.com.au/cube1600-back-to-wall-freestanding-bath_p4821433
expensive though
http://www.bunnings.com.au/cube1600-back-to-wall-freestanding-bath_p4821433