California Code, Code of Civil Procedure - CCP § 701.590

(a) Except as otherwise provided in this section, the purchaser at a sale shall pay in cash or by certified check or cashier's check.

(b) The judgment creditor may bid by giving the levying officer a written receipt crediting all or part of the amount required to satisfy the judgment, except that the levying officer's costs remaining unsatisfied and the amount of preferred labor claims, exempt proceeds, and any other claim that is required by statute to be satisfied, shall be paid in cash or by certified check or cashier's check.

(c) If the highest bid for an interest in real property sold exceeds five thousand dollars ($5,000), the highest bidder may elect to treat the sale as a credit transaction. A person who makes the election shall deposit at least five thousand dollars ($5,000) or 10 percent of the amount bid, whichever is greater, and within 10 days after the date of the sale shall pay the balance due plus costs accruing with regard to the property sold and interest accruing at the rate on money judgments on the balance of the amount bid from the date of sale until the date of payment.

(d) If the highest bid for an item, group, or lot of personal property sold exceeds two thousand five hundred dollars ($2,500), the highest bidder may elect to treat the sale as a credit transaction. A person who makes the election shall deposit at least two thousand five hundred dollars ($2,500) or 10 percent of the amount bid, whichever is greater, and within 10 days after the date of the sale shall pay the balance due plus costs accruing with regard to the property sold and interest accruing at the rate on money judgments on the balance of the amount bid from the date of sale until the date of payment.

(e) A person who makes the election under subdivision (c) or (d) is not entitled to possession of the property sold until the amount bid, plus accruing costs and interest, have been paid.