Someone who used this service a few days ago sent me this email: "I would have never thought that a one hour phonecall could be worth $500. It absolutely was. Selene is GREAT. Thank you both so much."
Maybe email and ask if they have time for a phonecall. And maybe offer to mail them the information and tell them there's an option for them to mail the letters to the LSAC.
Maybe email a professor, mention when you had the class with them, and ask can you go to their office hours or schedule a phonecall to discuss your interest in law school and them maybe writing a letter for you?