I camped west of Sault St Marie in two different parks for around $10-15/night - the first was
Pukaskwa National Park and the second was
White Lake Provincial Park. Not sure if you are going alone, but the rate was $25/night for a site and we were offered by the camp staff to share it between the two of us.
There's also
Sleeping Giant Provincial Park out in Thunder Bay, but I didn't camp there, so not sure of what it is like or the cost etc... but it should be about the same price.
It will be cold at that time of year, especially at night, so be prepared.
Here's a ride report of that trip I did.
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