As of my knowledge cutoff date in September 2021, the price of a Bangkok Post newspaper may vary depending on factors such as the sales channel and the specific location in Bangkok. However, as of that time, the suggested retail price for a single copy of the Bangkok Post newspaper in Thailand was 15 baht.
Please note that prices may change over time, and it's best to refer to the latest official sources for the most up-to-date information on newspaper prices. You can visit the Bangkok Post website or contact their customer service directly to inquire about the current price.