According to the website of Natural Habitat Adventures ( http://www.nathab.com/polar-bear-tours/classic-polar-bear-expedition/ ): "There are only two polar bear tour operators in Churchill with exclusive permits to access the full range of the Churchill Wildlife Management Area (WMA) where the best – and often only – polar bear observation occurs"
One of these tour operators is Natural Habitat Adventures. What's the second one?
According to their website, that would be Frontiers North Adventures, they mention their permits on the website (emphasis mine)
In addition to having permits to access areas of the Churchill Wildlife Management Area where only Frontiers North Adventures can go, we are also the only travel company with a license to host guests to stay at Cape Churchill in Wapusk National Park.
It's also in their brochure (p6, 9, 32)
[...] we also hold the most permits to operate on the trail network in the Churchill Wildlife Management Area
