This is a horrible metric; tons of these are clearly people googling about things somewhere other than where they live (c.f. Alaska, "gallon of milk").
Other comments allude to it, but this one should be at the top as it gives a good example as to why the methodology is suspect: pretty sure people in AK know what a gallon of milk costs in Delta Junction. I, a WA resident, would have to look it up.
There are other, similar examples of course. Price of weed in CO? Yeah, maybe residents are looking, but I'm more inclined to think the girl in Detroit is wondering, "I'm paying $250/quarter for pot, I wonder how much it costs in states where it's legal?" If I want to know how much weed costs in WA (where it is also legal), I pull up the website of my local store, not ask Google.
