How short are you? You could cut your binding strips 1.5", and sew to another 1.5" wide binding strip of scrap fabric. Then when you double fold, the scrap fabric is on the inside and no one will know any different. I have done single fold binding in a pinch in the past, but I don't really like it - doesn't seam as durable. Is there absolutely no way to find matching fabric to buy extra for the binding?