ChatGPT Plus is listed at $20 per month, but the final price varies by country...

https://lanescooljournal.inkharbory.com/posts/why-do-some-sites-claim-there-is-a-permanent-free-chatgpt-plus-trial

ChatGPT Plus is listed at $20 per month, but the final price varies by country and device. That’s because taxes like VAT or GST are added, plus app stores charge their own fees when you subscribe on mobile