Parking at my old work lot was a little over $1000 a year. However, night passes cost $40 for the year. A night pass would allow you to scan in/out after 4:30PM, and before 7AM. There were also visitors spots, where you'd take a ticket at the gate on the way in, and pay it on the way out.
For about a year I took a visitors ticket on my way in, and scanned out with my night pass after 4:30. Eventually parking enforcement caught on, I imagine because many people were doing this and they weren't making any money off visitor parking (despite the lot being full every day). They ended up installing scanners that could differentiate from in/out, and if you used your pass to scan out without having scanned in, your pass would get confiscated. Good while it lasted though!