If you use an online grocery delivery service like Instacart or Walmart+, you have likely seen the term “substitution” or “brand swap” on your final receipt. This occurs when the specific item you ordered is out of stock, and the personal shopper must select a replacement. While these swaps are designed to be convenient, they also have important implications for the final cost and quality of your order. Understanding what these brand swaps mean is key to managing your online grocery budget and avoiding unwanted surprises.

Why Do Substitutions Happen?
Substitutions are a solution to a fundamental problem in the grocery business: imperfect inventory management. A store’s online system may say an item is in stock when, in reality, the last one was just sold or is damaged. When the personal shopper gets to the shelf and finds it empty, they must find a replacement to complete your order. This happens most frequently with high-demand sale items and fresh produce.
The “Same or Better” Promise
Most online grocery services have a policy of replacing an out-of-stock item with a product of “equal or better” quality, often at no extra charge. For example, if you ordered the store-brand organic milk and it is out of stock, the shopper might replace it with a more expensive national brand of organic milk. The store’s policy is to charge you the lower price of the original item you ordered, giving you a free upgrade.
The Impact on Your Final Bill
While a free upgrade is great, substitutions can also affect your bill in other ways. If the only available replacement for your item is a larger size, you will be charged the higher price for that larger package. Furthermore, if you selected a specific sale item that is out of stock, the replacement will almost always be a non-sale item at its full price. This can quickly inflate the final total of your grocery bill.
Store Brands vs. National Brands
The most common swap involves store brands and national brands. If you order a national brand that is out of stock, you will almost always be given the store’s private label version as a replacement. Many shoppers find this frustrating, as the quality and taste can vary significantly. Conversely, if you prefer the store brand and it is out of stock, you might get the more expensive national brand, which can feel like a good deal but is not the product you wanted.
How to Manage Your Substitution Preferences

To avoid unwanted swaps, you must be proactive in managing your substitution preferences in the app. Most services allow you to approve or reject a substitution in real-time while your shopper is in the store. You can also set your preferences beforehand. Choose “no substitutions” for specific items that you are not willing to compromise on. Taking a few minutes to manage these settings gives you much more control over your final order.
Taking Control of Your Digital Cart
Brand swaps are an unavoidable part of the online grocery experience. They are a necessary solution to the daily realities of retail inventory. However, they are also a process that can significantly alter your final bill and the products you receive. By understanding why swaps happen and by actively managing your preferences, you can ensure that your digital shopping trip ends with a receipt that holds no surprises.
What is the best or worst substitution you have ever received in an online grocery order? Do you allow substitutions, or do you prefer to go without an item? Share your experience!
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