I am flying out of DTW North Terminal since Friday at about 8PM. I will return Wednesday at 6PM. I live in Ann Arbor, and I'm considering either driving or taking a shuttle bus (shuttle bus will cost about $40 for 2 of us, a bit less convenient and more time consuming), so I'm leaning towards driving if I can find cheap parking.
I need about 5-6 days of parking.

Does anyone have any suggestions for a cheap parking location? Are there any locations $5 and under? I haven't called around the hotels yet, but I will do that today and see what they offer.