Can I buy a lien check on its own?

No, lien checks are not available for purchase on their own and cannot be purchased/added later to a Vehicle History Report.

When you purchase a CARFAX Canada Vehicle History Report + Lien Check or a Vehicle History Report + Lien Check (BC) there's a lien check included.

The 3 Vehicle History Reports + 1 Lien Check also includes one lien check.