I found dozens of places searching for "CD replication" and "CD duplication" in various engines. Be warned that the cheapest place isn't always the best, though... see my message (I think called "a sad story" or something like that; search for messages by Monkey) for the gory details, but basically I got a fly-by-night company.
Make sure you have several ways of contacting the people you use and you know they are reputable. After all, for a decent sized CD run you are looking to pay them several hundred dollars, and you don't want to waste that kind of money... better to pay a dollar more per CD and have peace of mind and a good result.