Can I Buy a Re-Entry Permit at Chiang Mai Airport?

This information is a year old: there should be a counter specifically designed for issuing re-entry permit at Chiangmai airport. After you pass the security check point, look to the left. There should be a counter that issues re-entry permit. It is before the immigration check point.

Both me an my father have used that counter many times. But it was BEFORE they remodel the area. If I were you, I would call immigration office at Chiangmai airport and ask.

And remember, because the counter is before immigration check point, I believe you can always turn around and leave.