You must be very careful about bidding at a Trustee Sale. You need to make sure that you are not seeing a 2nd, 3rd trust deed being foreclosed on. Here in California, you need the whole amount in cash or cashier checks at the time of the auction. No financing available, though, I have some contacts for companies that may partner with you on the purchase or help you with the purchase for a fee. Scott was correct that you are buying as is and would be wise to remember that tenants may need to be evicted and there may be damage to the interior that may not be readily visible. I can get you free weekly lists by e-mail of all San Diego County notice of defaults, notice of trustee sales and reo. In addition, my customer service can send the deeds and notices for properties you are interested in. I also have a one page form that can be used if you buy at the trustee sale and want title insurance (recommended) and a binder (also recommended if you will be reselling the property in the next 2-4 years). Let me know and I can send you the form and also answer any other questions you might have.
See the following video on buying at trustee sales.