What are the costs and requirements for obtaining a business visa (Non-B) in Thailand?

The cost of obtaining a business (Non-B) visa in Thailand can vary significantly based on paperwork and the agency involved. Some reports suggest agents may charge as low as 20,000 baht, while others mention costs escalating to 90,000 baht without proper documentation. A Non-B visa is often linked to obtaining a work permit, which complicates the application process, requiring documentation from either an employer or legal representatives. At the immigration office, the standard fee for a 90-day Non-B visa is about 2,000 baht, and an extension for one year costs approximately 1,900 baht.