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The day after I used one of the travel agencies to get the visa in Bangkok for 2200 Bath, I met someone who told me about the new Myanmar consulate in Chiang Mai.
I went there the next day and you can get the standard 28 day tourist visa for 800 Bath (3 days) or 1600 Bath (one day).
None of the five travel agencies I inquired at told me about this, either because they didn't know, or they simply didn't want to tell me, because they would lose my business.
I had looked online at the official Myanmar government site and wikitravel.org and found no mention of the consulate.
It was opened in July 2015 and is located near the north-west corner of the old city at:
9/4 Manee Nopparat Soi3,
Amphoe Mueang Chiang Mai,
Chiang Mai 50200