Now, talk to your friends. Club members can help. Get their feelings on reliability, speed, and the accessibility of their technical support. I guarrantee that the cheapest service in the world is too expensive if you can't get help. Pricing is not a big deal.
Most services are competitive.
Many computer magazines compare prices. Most services offer 2 or more service levels, with a base price offering mail, and 10 hours a month, anything over for an hourly rate. For occasional users, this is your best buy. Worth the cost. For business purposes, shop around for business packages.