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I don't know about your preferred bookstore,
but at my Barnes & Noble or Books-A-Million, digital cameras are in the Photography section, parasailing is in Sports, and I suspect building home is in How-To or Construction. I see your point and I love killing time in a brick and mortar bookstore, but I don't think the online recommendations are any more narrow than what you'd get if you confined your searching to a single section of the physical store.

You'll definitely get a much better selection online. A B&M is only going to stock the best sellers, as Tony H. was complaining about earlier.
Updated - 2nd Apr 2012