The following are all individuals and organizations who provide hourly and project-based consulting. All consultants listed have many (many) years of experience in the industry, and in some cases- decades.
Wonderful Machine is who we refer photographers to who need help with creating estimates. They have a team of consultants who can help you craft an estimate for a client, on an hourly fee basis. They can usually book you in fairly quickly due to their large team. See their ‘Pricing & Negotiating’ service for this.