Shares of Amazon.com Inc. NASDAQ: AMZN were trading just above $220 on Tuesday morning, continuing to retreat from a stubborn layer of resistance around$240. We’ve flagged this level before as a potential triple-top risk, and the longer Amazon fails to clear it, the louder the bears will be. This is a pivotal moment for a stock still only a few big green days away from its all-time highs. It’s made all the more critical because the company’s banner Prime Deal Days event is only a few weeks away, and could ...