I live close to the MB border so I just pop across the border and pick one up in person.
Below is a screenshot from MB Snoman's website...I highlighted in red how you can order permits from any broker by mail.
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North Dakota $50 biennial (good for 2 years)
Minnesota $51 annual
Manitoba $150 annual
and I always buy the Ontario permit pre-November 1 to get the early bird discount
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this season...the sled is permitted up to ride North Dakota, Minnesota, Manitoba and Ontario....have ridden some in all 4 already. ND permit is also good in South Dakota and from what I understand the MB permit is good in SK.