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

https://www.bookmark-maker.win/chatgpt-plus-lists-at-20-per-month-but-actual-prices-range-from-about-13-to

ChatGPT Plus is listed at $20 a month, but the actual price you pay often ranges from $13 to $27. This difference comes from extra taxes like VAT or GST and fees added by app stores such as Apple’s or Google’s