Joe, Here is the site for Gov. properties for sale give it a look... http://www.homesales.gov/homesales/mainAction.do
It is part of the site the Gov. site for all it's sales.. http://www.govsales.gov/HTML/INDEX.HTM
The IRS auction site is interesting.. http://www.ustreas.gov/auctions/irs/index.html
For Bank REO/Foreclosures if you are interested you can browse the databases they created to give the public free access to the information..includes the bid/purchase info.. Sites like these..
http://www.pasreo.com/pasreo/public/propertySearch.do ... http://www.wamuproperties.com/
You can find the links to the bank sites here and more... http://www.mortgagenewsdaily.com/wiki/REO_Database_List.asp ... http://www.biggerpockets.com/bank-reo.html
Good hunting, Dunes