TransOcean – The Shipping Company is your ticket to the world of gigantic ships and transnational transport empires. Build a mighty fleet of modern merchant ships and conquer the seven seas. Track your routes and real time, take the controls as ships enter and leave the harbor, and see to it that freight gets loaded efficiently. Keep in mind that time is money! Excessive lay days are taboo.
USD$9.99 on Steam (discounted to 50% off, presumably because TransOcean 2 has just been released.
AUD$4.21 from this OzBargain deal, but the purchase may not work if you're careful with personal information
AUD$3.75 (AUD$3.09 plus a $0.66 fee) from G2A by choosing the "Best Price" option (scroll down a bit) and turning off the "G2A Shield" option on the check out page.
Here's a link to G2A and Paypal screenshots that I've taken after getting this deal just now. It's downloading to my steam library as we speak! :-)
Enjoy!