Dan and I both used Dive Assure. For Canadians (especially someone living in BC like myself), there weren't other options other than the quite expensive Costa Rican options. This worked well since I use Dive Assure for my diving in any event though I noticed that their prices (again, at least for me here in Canada) have absolutely skyrocketed from previous years. I prefer them since they cover liveaboards (including missing your LOB due to flight delays). That being said, they cover up to 30 days of quarantine (exceeding USD$2000) and COVID medical for $50,000 - the requirements for entry into Costa Rica. They will do up a one page letter for you to highlight this. I uploaded it into the Health Site before my departure and my QR code received approval at the border (I didn't have to queue elsewhere to get it verified or anything though I had come prepared with printed off policies, letters etc) so I had a very easy and quick border experience.