Parking and Directions
The Jericho Church on Arena Drive runs the cash lot, which used to be part of the Red Parking lot. I want to say $40 or $45 to park there.
I went to the Saints game and came in via Landover Road, and there is a cash lot there on the corner of Brightseat and Landover that was $25 (obviously not related to the Stadium). From this lot, the walk is far, but I speculate no further than the walk from Morgan Blvd. Metro.
Check out ebay, craigslist or any of the ticket resellers (Greatseats.com for example) for parking passes. Great Seats has Gray passes for $30 and Green for $35. GoTickets.com had them a bit cheaper. I'd also call the ticket resellers directly as well and see if you can arrange pickup.