Is anyone working on BCH brick-and-mortar POS systems for supermarkets and the like? I'd like to try and convince my local grocer to take BCH but I haven't been able to find any specialized solutions yet.

I suppose in theory you could just use a tablet with a full node for 0-conf payments, but I'm not sure a high-volume store like a supermarket would be comfortable with such an improvised setup.

They might want integration with legacy payment systems too. Though if the savings on fees are large enough maybe they'd try out a simple tablet with a regular client.