Are you looking for foreclosures that are currently listed for sale? or pre-forclosures to purchase at Trustee sales?
For properties that are already bank owned your real estate agent can set you up a filtered search for those properties (called REO's ) only. or you can search Metrolist for Placer County, I will put the link below- just click on Property Search in the menu bar.
You can also visit Fannie Mae, Freddie Mac and the Hud Home Store sites, but they also list most of their properties with local agents that use Metrolist.
For pre-foreclosure you can subscribe to services like Realty Trac or Foreclosure radar, also follow Trustee sale info in the paper or at the county recorders office.
Can I ask why you are limiting yourself to foreclosures? Many times they are not as big a bargain as they initially appear to be, just depends on your goals for the property and your skills to repair.
However, to find foreclosures and get good advice as to which ones are worth looking at, I would suggest finding a experienced realtor in your area who you can trust to give you foreclosures through the MLS. Also, once you drill down on a select list have your realtor run comps so you can make an informed decision on pricing.
I hope this helps.
Lyon Real Estate Auburn, Ca