Where to buy Natural Defense dog food

[Purdee]

Hello everyone, I'm desperately looking for a place that sells Natural Defense dog food for the past months. I used to be able to buy this brand at Walmart. It seems the manufacturer discontinued it; Walmart no longer carries this, London drugs has none in stock and no option to order online. I already checked Petsmart and Superstore. I'm at a loss. I have been trying to switch my dogs to other brands but it getting a bit expensive because it's a trial to see what they like.
I googled the brand and it was made by Mars. Their website had nothing on this brand. I phoned the number found on the bag but it was after hours.

Any info. you have is much appreciated. Thank you.