The Mavs have waived Big man (6'10") Bernard James who was the 33rd pick in last years draft. He would be a worthwhile pick up for the Spurs - his adjusted stats and history are as follows:
From ESPN:
"The 6-foot-10 center was the 33rd overall pick out of Florida State and a former staff sergeant in the Air Force with three tours of duty overseas. James, 28, started 11 games for the Mavericks last season and averaged 2.8 points, 2.8 rebounds and 0.8 blocks. His per-36 production as a rookie -- 10.3 points, 10.3 rebounds, 3.0 blocks per game -- suggests his game has potential."
He sounds better than RR or Baynes. 28 years old is old though.