How can I purchase a parking ticket on line? Do I need to purchase in advance? How much?

we found parking garages for as little as 10 dollars no advance purchase but there is an app called spot hero 10 off or park whiz

They didn't think we'll when they put that stadium in that location must pay meters or garages I have a handicap placard so I can park free at meters if you want to park close to stadium the more you pay $50.00 9th J $15.00 8th in J $10.00

Parking Panda, Spot Hero apps allow you to purchase tickets in advance for $25 or show up a little early and pay $20

Yes, you can and should buy parking online in advance. We paid $25 for the West Parking structure (don't remember the name too well, just as west in the name).