Parking in Stockholm

We are planning a road trip around southern Sweden this coming July. We plan to visit Stockholm for 3 days. We are very savvy about public transit and do not want to have the rental car in the city. We are hoping for something similar to the service we used in Vienna a few years back where we parked in a garage near a subway station on the outskirts of the city for €10/day. I'm finding hourly rates and monthly rates all around Stockholm, but no daily rates.

I wonder if anyone might have suggestions.

Tack.