ChatGPT Plus officially costs $20 per month, but the real price you pay often...

https://cesarsuniquenews.theburnward.com/why-do-referral-codes-not-stack-for-chatgpt-plus-trials

ChatGPT Plus officially costs $20 per month, but the real price you pay often varies between about $13 and $27. This depends on factors like VAT or GST taxes and extra fees added by app stores, especially on iOS and Android