Street parking and parking lots and ramps. It all costs money to park in downtown SA.
I believe there is on the street parking. There are lots to park in within walking distance. Parking is pricy, and if you go during La Fiesta, it is 20 or 30 bucks a day.
I seen some parking under Interstate 37 near Red Roof Inn for $10. It's not a far walk from there, we stayed at the Red Roof Inn and we walked everywhere.
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