Hosted Gateway Services

I am looking for any help on any companies that provide cloud based secured gateways or a hosted cloud based firewall? We are looking to find a SAAS Solution for about 10 project offices that have direct internet access. We do not have IT people onsite, and would like to setup a hosted secure gateway for thier firewall if possible. Any ideas or suggestions? Example, companies like Paetec or Global Crossings, Qwest offer secure gateways for thier MPLS services. I am looking for something similar but not from a telecom/data provider if possible.

Thanks