What are the current visa payment structures for retirement visas at the Koh Samui immigration office?

The user inquires about the fluctuating costs associated with retirement visas at the Koh Samui immigration office, noting that annual payments range from 6000 to 8000 Baht without receipt, totaling 12000 to 16000 Baht for both partners. They seek clarification on whether each immigration office has its own fee structure, as online sources indicate a fee of 1900 Baht each, and request feedback from other retirees using the Samui office.