You'd be surprised how many consulting firms, out-sourcing companies, and even computer stores are using the unused time on their computer equipment to provide Internet access. Describe your site to them and the type of connection you are looking for. For example, if you have an office LAN you want to connect to the Internet, tell them. See what they suggest and how much it will cost. Now, you have to be careful when it comes to costs.
Some providers charge a setup fee.
Others combine the two charges and you pay the service provider only. Others include this charge as part of your setup fee. Narrow the possible candidates down to two or three good prospects. Then, ask for references. The best way to check the quality of a service provider's service is to talk with at least three other companies using their service and get their opinions.