On any given Saturday, a Costco outlet can expect to turn $500,000 in sales.  One of the managers told me he sold a $53,000 diamond the previous day.  Products from lawn chairs to multi-packs of burritos tempt buyers-in-bulk.  A woman strolled by (without buying a book, I might add), and in her cart were a giant bag of lemons, a smaller bag of giant mushrooms - and a 27-inch color TV.  Did she go to get lemons, then decide she might as well get a new TV, too? 