Just to clarify from dealing with my clients and the reality of the marketplace.
First the majority of policies offered by insurance companies are per claim not per policy.
Secondly when choosing a deductible the lower the deductible the more favorably it is viewed by Citizenship and Immigration Canada. If the deductible is too high over $1000.00 I have seen many applications get denied. So it is not a question of premium but how it is viewed by Citizenship and Immigration Canada.
On a final note in reference to monthly plans I have not found any documentation on the Citizenship and Immigration website that allows for policies used for super visa for less than one year, I would assume this also implies the premium has to be paid up front for one year. In a monthly plan the person is only paying for a few month of insurance and if the ongoing monthly payments stop after the visitor has arrived in Canada this could potentially revoke the super visa followed by a deportation order from Citizenship and Immigration Canada. I have seen other posts on this issue on this site and from my understanding Citizenship and Immigration Canada is aware of the companies offering monthly plans and I would assume has taken appropriate action.
Keep in mind there is nothing wrong with monthly plans as long as they are not used for a visa with mandatory insurance requirement exceeding the coverage paid for.