Where can I buy an Army Rangers Knife?

A good friend of mine is going to West Point in less than a month and I want to get him something. Since He wants to become a Ranger in the 75th regiment, I figured I'd get him a knife that maybe has the Ranger patch or symbol on it. Is there any company or manufacturer that makes good or decent knives that I could have the Ranger logo or something etched into it? Thanks.