You will likely be looking at least 1,000$ if not a fair bit more to import a single gun of that value. It is not cheap no matter how you approach it today. You don't have to like it, but it is the post 9-11 world we live in currently. My costs to me from my customs broker is usually right around 500$, shipping is dependent upon how many guns, who the carrier is and costs on the UK side etc but 400$ is a pretty fair minimum, you will owe duty on it. Anyone who imports for a living like I do will charge you a fee, I charge 300$ per gun. If you come in with a batch of other guns it usually takes a fair bit longer but can be done for say 5-600$ per gun on average. I wish I could tell you that there is a fast and cheap way to get a gun imported, there is not.
Steve