With the recent 15% drop in Apple's (AAPL 2.22%) shares over the past month, Motley Fool tech and telecom analyst Andrew Tonner says that, at $550 a share, it's a great time to buy Apple. With the recent very well received product launches of both the iPhone 5 and the iPad Mini as we move into the holiday quarter, Apple's best quarter is ahead of it. And when you're talking shares of Apple, $550 is a steal to get in on such a great company.