Khloe Kardashian is already preparing herself in case Lamar Odom gets traded out of Los Angeles ... and a source close to the family tells TMZ she's open to moving out of L.A. to be with her hubby.

Odom was supposed to be involved in a blockbuster trade for Chris Paul ... but the deal fell through late Thursday night. Still, there's still a chance L.O. could still be headed out of L.A. sometime soon.