Local shops, if you have any, will usually be able to beat BBS' prices. Don't get me wrong, for a single piece of metal, they're great. But if you have a decent chance at ordering 25 units, or better yet fifty, a local shop will usually give you a better price.
Of course you have to talk to manufacturing geeks. They want certain things, and don't always translate from what you're trying to talk about. But if you can, in your own head, nail it down to particular pieces of metal, separate from the overall project, you should do fine.
Do you have a .dxf written up? I've run similar GBs in the past -- there's a pretty okay shop not far from me, although I'm too busy this summer to take on a GB myself I think. Maybe in the fall I can get back to such things.