Holly left a great answer. That will be the best way to search for foreclosures. I'd recommend contacting a Realtor to help you in the search. Not all foreclosures can be financed through traditional financing. Some require Conventional financing, others require 203k financing, and some can only be purchased cash. If you are looking for an investment, then some foreclosures have owner-occupancy rules that you must be aware of.
You may search on your own for foreclosures in Deer Park by clicking on 'Find a Home' to the left of your screen then select 'foreclosures' from the drop down menu. Either enter the zip code or select 'Deer Park' under the 'School District'. You will have some results that are in the city of Pasadena but you should get all of the results in Deer Park.
Your Realtor can also up a search for you. If you don't have a Realtor, I would be happy to one up for you.