Cal. Elec. Code § 18622

Every person who offers to buy or does buy from a circulator any referendum, initiative, or recall petition on which one or more persons have affixed their signatures is guilty of a misdemeanor punishable by imprisonment in the county jail for not more than one year, or by a fine not exceeding one thousand dollars ($1,000), or both. This section is not intended to prohibit compensation of a circulator, for his or her services, by a proponent of the petition or his or her agent.