There's a good listing of trumpets at Dolmetsch Online:
http://www.dolmetsch.com/musictheory29.htm

about half-way down the page. The most readily available kind of trumpet is the B-flat version, also commonly called a cornet.

But you'll never get a brass instrument (which includes trumpets) to sound like a saxophone. You're dealing with a metal mouthpiece rather than a reed. If you want a sax sound, why not go directly to a sax? They're a good deal easier to start off with than a trumpet in any event, since you reach the notes with the keys rather than by shaping your mouth.