Booked a reservation online via Costco Travel while standing in a Budget line that wasn't going anywhere fast. Walked over to Alamo kiosk and was done in less than 5 min. My cohorts in the Budget line remained there after I came back to let them know I was done.
Alamo had the car I wanted and there was no fuss at all. They also had plenty of agents to help, even when using the kiosk.