ChatGPT Plus has a list price of $20 per month, but the actual cost can vary...

https://www.foxtrot-bookmarks.win/chatgpt-plus-is-listed-at-20-a-month-but-the-actual-price-you-pay-often

ChatGPT Plus has a list price of $20 per month, but the actual cost can vary from about $13 to $27 depending on where you subscribe