The Mets and Derek Lowe are deep in negotiations, according to a source, and while an offer has not yet been made, he is highly coveted by the club. The Boston Red Sox had mild interest in Lowe, and losing out on Teixeira might prompt them to strongly consider bringing back Lowe for a second tour of duty in Boston. But indications from Red Sox sources point to less costly options than Lowe, who originally sought a five-year, $90 million deal but has scaled back his demands in recent weeks.