Samuel Dalembert, Bucks
Dalembert was a prized free agent in 2011, signing a two-year deal with Houston. A trade to Milwaukee has led to a decrease in playing time this season, though the Bucks have been using their center more of late, possibly to increase his trade value. Dalembert's price would be less than some of the other players on this list and, given that his contract is up after the season, his acquisition would indicate the Celtics want to win now. He is exactly the kind of player Garnett was thinking of when he talked about someone who could help the team in the short term.