The new Trade Deadline report from Fanhouse says that:
Don't bet on Roy Oswalt pitching somewhere other than Houston by the end of the month. One major league executive rated the chances of Oswalt staying with the Astros through the deadline and beyond at "60 percent."
Houston is apparently willing to offer some salary relief -- in the range of $4-5 million -- but it's unclear if that will be enough to entice most teams.
$4-5 million isn't going to cut it, if the Astros want any kind of prospects back for Roy. $10-12 million and this deal gets done.