The tours. The first tour I got by knowing someone I played with on the Glenn Miller band who needed trumpet player at the last minute, and I've been doing it ever since.
I'm not really sure what to tell you, I haven't had luck with the broadway contractors that Tony knows, but there are a lot of guys trying to get VERY few gigs from those contractors. There aren't many union tours out that carry trumpets anymore, so those gigs are in high demand.
The non-union shows aren't much easier to get, for different reasons. I've found the non-union contractors to be pretty lax about finding people, and pits are often filled by word of mouth, (which can be good or bad, depending on whose mouth is listened to) or simply by looking at a resume and listening to a demo, which can be misleading.
Some places to look for jobs:
Playbill: Find a Job : Index Network Presentations, Jobs Phoenix Entertainment
If you are going to do a tour, know that you will be playing exactly the same music for 9-10 months. It takes a certain kind of personality to still put out a fantastic product after a few hundred shows, I think you have to be a little crazy. It is not musically rewarding in most cases, but it is a steady paycheck.
I'm probably not going to go on the road next year, I'm going to try out real life for a change. Good luck!