The key to the boardibg process: get here 30 mins early and track down the mega bus luggage attendant and get a numbered card. You board the bus based on your number, which the bus driver calls out, not on your place in line which will start to form about 20 mins before your bus arrives. This gives you the chance to sit in the shade and wait it out until the bus arrives. You can hang around the front of the line and dont have to wait in line behind everyone until your number is called.
If you have a reserved seat or a red card they will call you first so listen for the guy yelling.
The ticket was only $14 and they had one option for a $7 ticket but it left too late/early for my schedule.