ChatGPT Plus lists at $20 per month, but the actual price you pay can vary...

https://dibz.me/blog/is-there-a-chatgpt-plus-free-trial-i-can-click-to-start-1223

ChatGPT Plus lists at $20 per month, but the actual price you pay can vary between $13 and $27 depending on where you subscribe. This difference comes from extra fees like VAT, GST, or app store charges added on top