I'm shutting down this post:
1. A single entry re-entry permit is 1,000 THB at a local immigration office, OR 1,200 THB at the airport (since they fill out the paperwork for you and take your picture).
2. You can get this re-entry permit at ANY immigration office.
3. The length the re-entry permit is valid for is for your current extension of stay.
4. Only Suvarnabhumi has the re-entry permit desk open
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. Depending on how you're flying out, it MAY NOT be possible to go from Chiang Mai International to Suvarnabhumi's re-entry permit desk. ONCE you cross immigration and stamp out of Thailand, you CAN NOT get a re-entry permit.
5. We do not mention or discuss agencies in the group.
Thank you