ChatGPT Plus is listed at $20 per month, but the actual price you pay often...

https://wiki-velo.win/index.php/ChatGPT_Plus_Turkey_Price:_How_Are_People_Paying_$13_to_$15%3F

ChatGPT Plus is listed at $20 per month, but the actual price you pay often varies between $13 and $27. Differences come from taxes like VAT or GST and app store fees on iOS and Android