If not permit only, park in the red deck if you plan on spending $50 in the battery because it's free with the validation for the entire game. Otherwise pick parking last minute online or if you don't mind walking, you can walk from nearby shopping lots for free.
$50 at the park, for a whole game. They charge by the hour. You can purchase discount parking passes online ahead of time.
I parked in the red lot for $18 which is right next to the battery.
Cheapest I paid was $16 through Ticketmaster and had to walk for about 15 minutes to the park. But closer spaces are available for a few bucks more.
Yes, there are several parking garages around the stadium to pay for parking. The most, the parking is free for a couple of hours and then there are different fees for the number of hours you stay. If you are going to see a game there is an option to prepay for the parking.
I picked up a parking pass on Ticketmaster for approximately $24.50. I believe there are other lots that may be a slight bit cheaper but further away.
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