The Right Resource has a 3-tier service structure:

Contract: Ideal when complex esoteric knowledge is needed for a component of a project, or for when extra talent is needed to make deadlines. A consulting professional is supplied, and becomes an immediate contributor. Any hourly demand can be met, and the individual can be released immediately once services are no longer needed.
Contract-to-hire: A “try before you buy” scenario. Often a consulting professional is such a good match technically and personally, it’s only natural that they evolve into permanent staff for the client. Unlike other firms, The Right Resource encourages clients to hire our consultants as permanent members of their staff. If kept for the initial contract period, this is a NO FEE transition.
Direct Placement: In situations where the initial interview reveals an ideal match, we recognize the benefit of the addition of permanent staff. Clients are welcome to hire the individual for a one-time placement fee.

The Right Resource also offers a guarantee of service. Ask about it!