What is the best way to obtain a re-entry permit for a non-immigrant 'B' visa in Thailand and what are the associated costs?

To obtain a re-entry permit for a non-immigrant 'B' visa in Thailand, there are two primary methods: obtaining it at your local Thai Immigration office or at the airport. The cost for a single re-entry permit is typically 1,000 THB at the immigration office. If you choose to get it at Suvarnabhumi Airport, there is an additional 200 THB service fee for photo and document handling. It is advisable to obtain your permit in advance at the immigration office to avoid extra fees and ensure you have all necessary documents, including a photo.