Lewis
You can use http://www.maricopa.gov to find information like this see what has posted recently. I am assuming you have done your research and understand how the tax foreclosures work?
You can also, if you are looking to buy a home and want to go about it in an easier way but still get a good deal (they do still exist in the MLS) use the search link below, it has a specific section in it called Special listing conditions, check the boxes that are appropriate for what you want to find.
I hope this helps generally the tax sales are done once or twice per year but I forget which months, you can go to the court house and find out.

Lewis

Give this a look....Tax Lien Sales...http://treasurer.maricopa.gov/research.htm

Arizona - Foreclosures and Tax Lien Sales Links
http://publicrecords.onlinesearches.com/Arizona-Foreclosures…

The Banks and the Gov. have created web sites for the Public so they can get answers directly from them on how the process works and view their Properties listed for sale...Free and updated constantly

Sites like these...https://servicing.chase.com/REO/Property/FeaturedProperties
http://www.nhmsi.com/ ... http://www.homepath.com/ ... http://bankofamerica.reo.com/search/propertysearch.aspx

You can find the links to these Bank and Gov sites here..Free ...
http://www.mortgagenewsdaily.com/wiki/REO_Database_List.asp
http://www.biggerpockets.com/bank-reo.html

Good hunting, Dunes

The knbk below will take you there! Good luck!