Instacart (or Shipt) are third-party services that partner with retail stores to deliver items. Some stores, like Michaels, for example, do their own deliveries. Other stores though use Instacart or Shipt to shop the orders and deliver them. These third-party companies have their own websites where you shop the products and pay their fees. They don’t offer sale prices or deals, so you’ll likely pay more with these services.