I've used the 1800 Market Street Garage. It's relatively close, and price wasn't terrible for a few hours. I don't remember the exact price, but it was about what I'd expect for a garage in Philly.
Waze the app will help you find best parking. Saturday and Sundays are free parking so I would take advantage of the street if you aren't worried about your car. If you are worried about the exterior of your car, 20th and Samson has a parking lot that is average parking price.
Lol no lucky my mom lives downtown better off parking on the street its Sunday free parking
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