Where can I buy some good, authentic tzatziki sauce?

[Therion]

Loblaws sells Quark Cheese by Western Creamery. It's just like I remember from the old country, where my granma used to make it. Quite expensive, though, almost twice the price of regular cottage cheese.

 

[Coltaine79]

I bought some Quark from Metro I believe - not sure the brand, perhaps Liberte?

It wasn't that good.
Definitely not like how I remember it from Germany.