Quite a lot of the streets now around the stadium are now pay parking. You'd need to check where you are parking though as some areas cost nothing after 6pm whereas others are up to 10pm.
If you are heading towards the stadium from the City along Victoria Road - try the streets on the right hand side before Church Street. A number of those streets aren't pay parking up to a certain point. (Fennell, Isabella, Bellevue, Grose and various side streets).
The Leagues Club parking is members only.
There is a Rotary (or Lions Club) parking for ten dollars opposite Parramatta Pool on O'Connell St but you'd need to be there pretty early as it fills up quick.