What are the best options for extending a 30-day visa waiver by 3 days in Thailand?

The user is seeking advice on extending their 30-day visa waiver by approximately 3 days while in the Sakon Nakon area of Thailand. The discussion includes suggestions for visiting the local immigration office to purchase a 30-day extension for 1,900 Baht, as it is the only option available regardless of the shorter stay needed. Commenters confirm that the extension costs the same regardless of the time remaining on the current visa.