In a statement to CBC News, a spokesperson for Health Canada said it is no longer procuring rapid tests en-masse. The agency also says there are no plans to replenish the federal inventory after it is depleted.

That means pharmacies have been purchasing the tests from suppliers and selling them, like any other over-the-counter merchandise. Pharmacists say the supply is sometimes thin.

"We kind of hunt them down and make sure they're Health Canada approved," said Kyro Maseh, a Toronto-area pharmacist.

Artron Laboratories Inc., which manufactures COVID test kits, said in an email it has increased test production in the past few months, and is expecting to ramp it up even more for the upcoming winter season.