Like all the Realtors below, I would love to have you visit my website or call me and I can assist you as well. However, if your real question is how do I find foreclosed propertes in the Tucson area, or for that matter anywhere in the US, without contacting a Realtor first, I would consider logging on to Realty Trac-They have the most comprehensive listings of homes that are in foreclosure (bank/corp owned) or heading there(short sales). They will provide semi-complete info for free-for a fee they will provide access to more in depth info on the homes they have listed. If you decide to logon and find something you are interested in, then I fully support the recommendation of the other 'pros' in terms of representation, inspections and the process involved in these purchases, to contact a Realtor to help you negoitiate the complexities involved.
I have included the link for Realty Trac below.
I would be more than happy to assist you in looking for foreclosed properties and/or acreage here in Tucson, please feel free to shoot me an email and we can go from there!