Floc de Gascogne in Edmonton
I have never tried it so as a result have not looked for it but the two stores that cleopatra999 mentioned are good ones. Ed Fong at DeVines knows his stuff.
I did a check at the Alberta Liquor Guide web-site with no success.
An alternative? Perhaps Pineau des Charentes. Can usually be found at better wine stores. It too is a fortified white wine. Fortified with cognac rather than armangnac. A little on the sweet side with an "apple" finish.