After asserting itself as an overshadowing presence in retail, Amazon is still experimenting with ways to leave a similar mark in groceries. The company’s latest tweak to its service lowers the minimum price for free grocery deliveries to $35. However, most customers using the service will also need to pay a $10 monthly subscription in addition to having a Prime membership ($15 monthly or $139 annually). To participate, you must live in one of the 3,500 supported cities and towns in the US.... Read this story