Instruct: Classify Amazon reviews into positive or negative sentiment
Query: good resource

While I haven't used this book to shop until I drop, I have used it when I want to shop for something specific. It is organized by type of items sold but also has an index in the back that allows you to see what stores are in a certain location (by city). I like the latter because I found there was a store I used to go to elsewhere (out of my way) right around the corner from my office. I also use it to find other stores that are near a place I am already headed for.