ChatGPT Plus is listed at $20, but the actual price you pay can range from $13...

https://www.pfdbookmark.win/the-listed-20-price-for-chatgpt-plus-often-varies-between-13-and-27

ChatGPT Plus is listed at $20, but the actual price you pay can range from $13 to $27. This difference is mainly due to taxes like VAT or GST and fees added by app stores, especially on iOS and Android