Tasmania's own ink makers have a new deal running this week that's actually very good value. Purchase at least $60 of their ink and receive a 30ml bottle each of Sailor's Delight, a fiery red/orange reminiscent of the sun setting over the ocean, and Ghost Ship, a deep indigo with subtle orange sheen. No code needed, they're automatically added into your cart at checkout. Since the free domestic shipping threshold is only $30 you won't pay any more if you're here in Australia.
(Note: the link contains the names of two other inks, ignore that as I suspect they have recycled the link and updated the page to reflect the current deal.)