JB Hi Fi do click and collect on carpet shampoo https://www.jbhifi.com.au/collections/home-appliances/bissell

that stuff lasts for ages as you only have to use about 30 ml in the hot water at a time. You can't use more as then the machine with over flow with bubbles

I would personally go in store to JB and bargain for $50 off the cleaner and shampoo together