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If you would like more information about how to obtain your Canadian Marijuana Card, here are a few resources for you. While you are free to go to one of the doctors out there that is advertising that they write recommendation letters, you should always consult your physician first and see if they'll write you your recommendation first.
Canada Department of Health - Medical Marijuana Commission
The Canadian Health Authority is the ruling body of the medical marijuana program in Canada. They are the ones you submit your patient applications to and they're the ones who can best answer any questions you may have about the registry process.
Marijuana Clinics
Canada Marijuana Card and Goodgames are both multi-location clinics that have doctors all over the state within their network that write recommendation letters. If your PCP will not write you a recommendation letter, this is where you can go to find a doctor near you. They offer payment plans and often run specials on their consultation costs.