How much do you offer the seller for a pre-forclosure purchase?

[Jobin Nash]

This is in addition to the closing price (all the monies needed to prevent foreclosure and take possession of the property).  One source said 1-2 k above closing price.  Another said 5-10 k above closing price.  But I can't seem to find a definite answer.  This is assuming there is enough equity in the spread, of course.  Thank you.