I had this injection done at the hospital by doctor referral. I had Durolane filled by my pharmacy ahead of time (as it needs to be ordered in). A radiologist did the injection under x-ray guidance and told me about the cheaper price at Costco. From what I understand you don't have to be a member to use Costco's pharmacy but you do need a prescription.
Early in 2013 OHIP decided to no longer pay for the procedure and hospitals are now charging a fee to have it injected on the premises. This makes me mad as OHIP will still pay to inject cortisone into your hip but not viscosupplementation.