I haven't seen CMF in a number of Calgary Walmarts since Series 11 (Series 10 was last I saw them). TRU also had a very sparse stock of Series 11. Other than my first sighting of several loose packets laying around I haven't seen any box of them last year.

Now that more Targets are opened here they have come to the rescue and they do stock CMF.

i have seen series 11 at my walmart, but only for a brief time before christmas. same at my target. i think they sell out very quickly due to the low price point compared to lego sets and they don't restock once they sell out.

I lamented too soon.

Yesterday I saw several unmolested boxes of Series 12 at one NE Calgary Walmart Supercentre. I only needed 9 but took an empty box with it --  there's a market for that too.