ChatGPT Plus is listed at $20, but the actual amount you pay can range from...

https://blogfreely.net/samuel-wang09/chatgpt-plus-file-upload-failed-is-it-the-20mb-image-limit

ChatGPT Plus is listed at $20, but the actual amount you pay can range from about $13 to $27. This depends on where you buy it. For example, buying through the web avoids extra fees that come with app stores like Apple’s and Google’s