This is what I found on the county website. The link below should take you to the auction information. I don't think you can use financing with these type of sales.
Los Angeles County does not sell Certificates of Tax Liens nor does any other County in California at this time. Auctions of Tax Defaulted property are generally held twice a year. Anyone who can legally own property can bid on a property. Registration is required with a deposit that will be applied to a purchase or refunded if not used to purchase a property. Terms are cash or cashiers checks only payable at the auction immediately upon being awarded the sale by the auctioneer. If the sale is over $5,000, a 10% or $5,000 deposit must be paid at the time of the sale and the balance must be paid within 30 days. The deposit is forfeited if the sale is not completed timely