Marcus Camby isn't that good. Yes, he fill up a stat sheet, but his individual one on one D leaves much to be desired. And his offensive game is actually quite brutal. He's one of the biggest frauds in the NBA in my opinion. He's almost like Antoine in the sense that even when he's considered a "good" player, you know the stats he's putting up are largely inflated and not indicative of exceptional basketball performance.
Anyhow, I'd give up Scal, Tony, Walker, and Giddens. I'm not sure if we'd have to add about $2-$3 MIL in cash, but that's the farthest I'd be willing to go to make a Camby to Boston scenario pan out.