Will you be going to Sydney next month to display your products to a captive audience?
Deta or Bunnings may wish to cover your costs as sponsors, both travel and accommodation, as it will boost their sales and generate further sales leads, and a groundswell of enthusiasts, and show support for Aussie innovation. They may also offer their Deta products (and other home automation products) for a cheaper price for attendants or purchases on the night in the form of discount vouchers or actual products. Maybe Kogan may wish to support you as well as have a sales and marketing outlet?
Reading about a nifty product on a forum is one thing. Meeting up with the innovator, seeing and handling the product, watching it get easily assembled inside the original Deta casing, and being able to ask questions and have them answered on the spot is another. Getting one into your hot little hands RIGHT NOW without having to wait and pay for postage is another. Buying frenzy is awesome to watch, and can be frightening when you get to the last few left. People will happily pay upwards of $100 towards your R&D expenses as enthusiastic support if they get a prototype or early release model to play with, even if it is personally autographed with a Sharpie on the inside PCB where it can't be seen assembled.
Bring a big suitcase full, as you will sell the lot on the night! People will come, just for the privilege to buy and support your product and shout you a beer. Even if you only have a sample prototype that isn't available for sale yet, the buzz generated for you as a guest speaker will make the evening enjoyable for enthusiasts, and have spinoff benefits for future sales, industry contacts and access to other bright innovators and sponsors, as well as priceless organic publicity. You don't have to be a marketing guru - your product sells itself and you just have to be there to answer the questions, and sign autographs.
Of course the Melbourne people will want to start something too. Maker clubs or local uni departments may come to the party, or even a Saturday session at a local Bunnings with a sausage or two (and a screwdriver).