Apple today dropped prices of its Retina-equipped 13-inch MacBook Pro by as much as $300, and lowered the price of its top-end MacBook Air by $100.Some models of the company's laptop line also received processor speed increases, with the 13-inch MacBook Pro with Retina now sporting a 2.6GHz Intel Core i5. The two stock 15-inch MacBook Pro with Retina notebooks also got a performance boost.