From the Home & Garden website - "A limited number of visitor car parks are available below the main public walkway, the charge is $8 per day (cash only)."
Assume casual rates for the rest which is usually $10/day
On that matter, I think we need to have a word as well. I suspect it wont end well for you :o)
Choose your tray O Dark One. Death by tray it shall be, for thou will be defeated.