WD 1TB Hard Drive

I purchased a Western Digital 1TB My Book Essential Edition USB 2.0 External Hard Drive WDH1U10000N this morning. The total is $113.95 including tax & shipping. I used Bountii to find the cheapest deal online, then I used Resellerratings to check the store rating. I read many customer reviews on Amazon and Newegg.
Walmart has this drive sold online at $114.00. But yesterday when I went to its local store, the store price was $159.99. Other than easier return, why bother visiting any retail stores if I can shop online?