You can buy it in the bus terminal without problem and at the same cost. There are also a couple of sites where you can search for tickets for the southeast region: www.ticketbus.com.mx and www.ado.com.mx
Location: Places >> North America >> Mexico
do you need to buy bus ticket online ?
Sunday I going to mexico city from San Diego with a couple of friends.
I travel in Colombia where you never need to buy a ticket in advance, you just buy it at the border.
But in the USA if you not buy it online it's much more expencive
I never been to mexico, I would like to know if I need to buy it in advance or not.