Walking up and down aisles of a retail store, scanning row after row of products to help keep track of inventory is one of the most tedious and time-consuming tasks store employees endure, and most dread the assignment. This is especially true for a company like Wal-Mart Stores (NYSE: WMT), which can have as many as 200,000 products lining its shelves.The cost of not completing this monotonous chore can be high.