ChatGPT Plus lists at $20 per month, but actual prices range from about $13 to...

https://smoothdecorator.com/why-did-openai-keep-chatgpt-plus-at-20-since-february-2023/

ChatGPT Plus lists at $20 per month, but actual prices range from about $13 to $27 depending on where you subscribe. Differences come from taxes like VAT or GST and extra fees app stores add on iOS and Android