From what I've heard any insurance through the Canadian Aerial Applicators Association, which means almost every aerial applicator in Canada, requires a spray course and they are all around the same cost
AFAIK. There are a very few aerial application companies (from what I've heard from spray pilots it sounds to be around one or two nationwide) that have insurance from someone else and do not require the spray course. Unfortunately that's all I know. Hopefully someone will pipe up about who doesn't require the aerial application course for you.