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

https://yenkee-wiki.win/index.php/Is_It_Safe_to_Use_a_Foreign_Payment_Method_to_Get_Cheaper_ChatGPT_Plus%3F

ChatGPT Plus is listed at $20 per month, but the actual price you pay can vary between $13 and $27. This difference comes from extra fees like VAT or GST, and additional charges on app stores for iOS or Android