PYRAMIDS AT GIZA

i AM VISITING CAIRO AS PART OF AN AIRPORT STOPOVER ON THE WAY TO INDIA. I CAN REACH GIZA BY 2pm ON MONDAY OCT 1. HOW CAN I ENSURE I CAN GET INSIDE ONE OF THE LARGE PYRAMIDS SINCE I'VE HEARD THE TICKET OFFICE SELLS ALL THE TICKETS FOR THE AFTERNOON AT 1:30PM ?

ED HURLEY