For the rest of today and tomorrow you can get 15% off some quality fountain pens from Galen Leather (no code required). Shipping is extra, but I've bought a few things from them before and they don't charge excessively for it. All prices are in US$ but the site may auto-adjust to AU$ if it detects you're coming from Australia
While you're there, check out some of their leather products and desk accessories, too, for a wide range of interesting things. All leather products are handmade in Turkey, using nice, thick leather that will last a long time.
Pro tip: if you add some items to the cart and don't complete checkout, within a couple of days you may receive an email with a message reminding you to finish the purchase and offering a discount code to entice you. No idea if the prices will automatically revert to normal, though, so do this at your own risk.