Looks like they’ve finally settled on a firm number. From the Senate GOP:

CNN: However, Jim Manley, a spokesman for Majority Leader Harry Reid, said the deal will ultimately include two amendments that have already passed with broad support…Those two measures bring the total to $827 billion.
AP: Officials put the cost of the bill at $827 billion
AP: A comparison of the $827 billion economic recovery plan…with a $820 billion version passed by the House. Additional debt costs would add about $350 billion or more over 10 years.
McClatchy: The Senate plans to take a final vote on its $827 billion economic stimulus package at noon Tuesday
Wash Times: The reported $780 billion price tag does not include several amendments that Republican leaders have said would bring its total cost more than $827 billion.
Wash Times: an $827 billion version of the bill.
CBS: Last night Democratic leaders reached a deal…which now totals about $827 billion dollars.
FOX: Officials put the cost of the Senate package at $827 billion