Rewe, the German supermarket chain, is set to launch a grocery delivery service based on a monthly subscription free, according to a report in Lebensmittelzeitung. The move follows the trial of a similar offering by the retailer in Austria, and comes as US e-commerce giant Amazon is reported to be entering the German market with its own subscription model grocery service, Amazon Fresh. Prices for Rewe’s new ‘free’ (on demand) delivery …