Depending on your group size etc... You can try contacting this
company:
Golden Season
Website contains details:
http://www.army-technology.com/contractors/transport/golden_season/index.html
It's a local company that markets military equipment to the
overseas market...
From previous enquiries for my own trips, they'll willingly cater
so long as your order is decently big (100 plus packs). Since your
trip is long, and I assume you're not going alone, maybe you can
combine with a few people to order.
Another thing to note is that since they mainly cater to the
military market, they might reject your order if they aren't
currently in the middle of producing a batch. They shut down their
manufacturing lines if there isn't a current military or
governmental order.
Try your luck.
