Tim's answer below is direct and to the point. Harsh, maybe, but Trustee Auction is no place for the unprepared. LPS Agency lists many of the auctions in San Bernadino County: http://www.lpsasap.com.
You need to register but there is no fee. Others can usually be found on Auction.com. I have consulted for clients at the sales in neighboring Riverside County. Just be prepared.
Byron Lohman, ABR, CDPE, SFR
Prudential CA Realty
CA Lic #01272085