Having just completed an oil change I went through the various oils readily available to us last weekend.
I ended up purchasing Nulon 5W-30 Euro in a 10 litre pack for $120 from Autobarn as I had a 20% off voucher. Regular price was $146 for 10 litres.
I found the Castrol Edge Sport 0W-40 at Repco and Autobarn for $73 for 5 litres.
Strangely, Bursons was the most expensive quoting an incredible $107 for 5 litres of the Castrol Edger Sport 0W-40. Initially, I thought this was an error so asked for the price to be double checked only to be told it was no error.