Suvarnabhumi has re-entry permits available
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for people who are flying out. They are only sold in Departure 2, and they cost 1200 for a single re-entry and 4000 for a multiple re-entry. No need for a photo or a form or any copies (that's why it's 200baht more than the real price at immigrations :P) Just tell someone you need a re-entry permit and they'll get someone to man the desk for you :)