The vast majority of Craigslist ads are free to post. The exceptions are job listings in certain cities, brokered apartments in New York City, therapeutic services and dealer-sold tickets or motor vehicles. Craigslist doesn't accept PayPal for these listing and relies on American Express, Visa and MasterCard credit cards only. However, Craigslist cryptically suggests additional payment options could be available when using a paid posting account, but it offers no further details.
Using PayPal With Advertisers
Paid listings and paid posting accounts are the only commodity you might purchase from Craigslist. All other offerings are from individual advertisers who are selling items or services to other users. Whether they accept PayPal is completely up to their terms, but many sellers prefer cash and are cautious against PayPal payments for fear of encountering a scam or unreasonable dispute.