How much does it cost to park at the RNA Showgrounds

[Mr White]

There is a function there that i'm going to in a couple of weeks. Since I live in an area devoid of public transport, i'm going to have to drive there. I've been on the RNA Showgrounds webiste, but it has no useful information whatsoever. It says "During shows and exhibitions there is a charge of $10 per day", which is referring to big events like concerts, the Ekka or Oktoberfest. However, it doesn't say how much the parking there costs during any other time of the year.

Anyone know how much parking there costs?