It's not very common that the New York Yankees make in-division trades with their rivals in the American League East, although a trade before 1999 with the Toronto Blue Jays did land them Roger Clemens.
However, with the Yankees need for pitching as the season wears on, especially with the news of CC Sabathia being out until at least July, it almost all but makes certain that the team will be looking for pitching help between now and July 31. There are the common names in Cliff Lee, Jeff Samardzija and Bronson Arroyo, but with the Blue Jays likely not factoring in the playoff race, two of their starters are listed as potential trade options.
Andy Martino of the New York Daily News has listed Blue Jays starters R.A. Dickey and Mark Buehrle as potential trade options for the Yankees this coming summer if and when Toronto is clearly out of the race.
"So the Yankees might instead have to use their financial advantage, trading for heavy contracts that are no longer useful to losing teams. Arizona’s Arroyo is in this category, and if Toronto sinks, Dickey and Buerhle will be, as well."