ChatGPT Plus lists at $20, but actual prices often vary between $13 and $27...

https://www.play-bookmarks.win/chatgpt-plus-officially-costs-20-per-month-but-the-actual-price-you-pay-can

ChatGPT Plus lists at $20, but actual prices often vary between $13 and $27 depending on where you subscribe. Differences come from taxes like VAT or GST and app store fees added on Apple or Google platforms