Things to strop with in a pinch...
from link:
I have tried using newspaper just like Mike, but I've seen an improvement after putting just a few small dabs of MaaS on first, work it in and let dry. I would not want to do this on a strop because of the other chemicals involved, but a newspaper ends up in the trash or recycled so it's all good. The good thing is that stuff is already hanging around at home if you buy razors off the bay.