I live in the Detroit area, Oakland County. Only one store I know of has anything Pentax and thats "Camera Mart" on Telegraph Road Pontiac MI.
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The last time I was in Camera Mart they did have the K-7 and some lens (this was before K-5). But I would call them first before driving too far to see what they have you may be interested in.
There are a few Ritz Camera shops around as well. They usually don't have Pentax stock.
Can you believe I bought 80% of my system here local at Adrays Camera that's now out of business. They had a large selection of Pentax gear relatively speaking...