I can sympathize. For the first time ever, I forgot to get the fabric for the binding(which I would want to match the border).
I just discovered this and, of course, couldn't get any more of that fabric. I was able to get something very similar from same manufacturer but had to pay extra shipping to get here quickly. It's supposed to arrive tomorrow. Have to have this done within a week and a half.
This is a big lesson in "live and learn" and "do your homework".