Amazon has launched a pilot program for ultra-fast delivery designed to drop off groceries and other household items in as little as 30 minutes, the company announced Monday afternoon. The Amazon Now (NASDAQ: AMZN) service is now available  in parts of Seattle and Philadelphia, at a cost of $3.99 for Prime members and$13.99 for non-Prime members. Orders below $15 will be charged an extra$1.99. The announcement follows last month’s expansion of Amazon Now in the United Arab Emirates, where customers can ...