Is this even possible?

[Cam Galasso]

Is it possible to buy a property from the owner AFTER the property is scheduled to be sold at an auction? 

If not how do I find a list of tax delinquencies? I've seen this "sheriffs list" but that seems to be the properties that are set for auction already. I guess i'm looking for the pre foreclosure list for tax foreclosures. Is that even possible or are they automatically set for auction?

I am sorry in advance is this is a dumb question. Thanks for any help