Natural exfoliant bar

It's winter where I live and I am in need of an exfoliant for dry skin. I'm trying to minimize/eliminate plastics and excess packaging from my life, so ideally, I'd love a scrubbing bar rather than anything in a tub or tube. Something like the Soft Services buffing bar but without the gross dyes and $30 price tag. I already dry brush, but need another layer of physical exfoliant. Any suggestions?