Amazon on Thursday began offering same-day delivery of grocery items from Whole Foods Market to Prime members in four select markets. For a minimum order of $35, Prime members get free two-hour delivery between 8 a.m. and 10 p.m. One-hour delivery is available for a $7.99 fee. Among the items customers can order for delivery are fresh produce, meat and seafood; grocery staples; flowers; and some alcoholic beverages. They can place orders at the Prime Now website or through the Prime Now app on an iOS or Android device.