I had some beat-up silver ones powder coated with a 'wrinkled' black finish that looks real nice. Cost me $100 total for six pockets and four corner miters. That could be an option for you.
I'm bumping this up as I again need to 2 Gandy corner castings for a guy whose moving company managed to break two of them in the move. I've found 2 spots to buy at $65 and $75, but he's 78 and not rolling in the dough...