How to reach potential customers with limited working capital/ideas for cost effective marketing?

[Marisa]

True start up staffing agency in need of job orders. We have been able to recruit qualified, awesome employees but having hard time reaching potential clients/employers. We have advertised our business via fax/mail/email/Facebook etc. utilizing flyers and introduction letters. We cannot afford radio or television commercials. Open to any other ideas to land accounts and place employees.