Shopping online is no guarantee that you’re always going to get a cheaper price than you would at a bricks-and-mortar store. Depending on what you’re buying, you still may pay less at a local retailer or a warehouse club, such as Costco or Sam’s Club. But convenience is a selling point too. If delivery is free, then offline price advantages can evaporate. Here are some items that are cheaper online or discernibly more convenient to have shipped to your door — or both.