I'm not exactly for trading for him, but his last two years are 9.1 and 9.8 million. Not exactly a bank buster. I just don't think there's a trade that will benefit the Spurs unless they are willing to let go of one of their expiring contracts. Manu won't be traded, so Jackson would be the obvious choice. But obviously Cleveland won't fall for that.
Either way, SA is not a place that FA come to, so I wouldn't try to clear cap space for anyone, especially with Manu and Tim about to retire.