Try Charming Indochina Travel , they are a good professional outfit

http://www.charmingindochina.com/

It is easy to deal with Vietnam visa.
Failing that just go to Sa Pa and do the arranging there

We did a trip to Muong Hom markets and that was 60 dollars a few years ago but there are more operators there now

Cheers

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vakantiehuizen pals
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