Liquid Leads: coverage, parameters, grades and pricing (free).

Free. Local business leads by category and place for B2B prospecting and cold outreach: a lead list of US small businesses (dentists, plumbers, salons, contractors...) with verified emails (graded A/B/C), a contact name when the email shows one, phone, a website proven by the business's own phone number, socials and buying signals (no website, online booking tool, payment system, hiring).