Thank you for your enquiry. General Public tickets for the Ashes are sold via Ticketmaster - Tickets for Concerts, Sport, Arts, Theatre, Family, Events, more. Official Ticketmaster site 

There may be limited tickets available to purchase at the gate box office on match day - Please note that tickets are not held back from sale for this purpose, if the event is sold out in advance online there will be no tickets available at the gate. 

Patrons are encouraged to purchase tickets in advance to avoid disappointment, public transport services are included in tickets.