International players won't be available for teams to sign for just money if Bud Selig gets his international draft he wants. So you can count that out.
Boston's 2nd tier players they signed are not the reason the Red Sox are competing-- it's more due to David Ortiz, Dustin Pedroia, and Jacoby Ellsbury being healthy, and Nava surprising everyone. This is still basically the same team as last year..when it was 100% healthy before their swoon when David Ortiz got hurt.
Boston is going to face a real test when Ellsbury, Napoli and Drew leave via free agency this offseason..remember, Boston blew a ton of money taking on Peavy's contract, not to mention they bullpen help, a 1B, a LF and a SS, depending on Bogaerts' development.