Sure thing Ken, Barbecues Galore carries chunks, two locations in Calgary: Edmonton Trail at 35th Ave NE and 9th St at 58th Ave SE.
They carry apple, cherry, hickory, mesquite, oak, alder, beech, olive, white cedar and maple.
A little later this year they should have some pecan chunks (Weber). They also carry all of the BBQers Delight pellets and Smoke Stix (giant pellets). THe Jack Daniels pellets are awesome.
I don't know if this one is still viable but about 5 years ago I scored apple and mesquite logs from a landscape supply place right beside the airport, quite cheap compared to the retail packaged chunks. I don't recall the name of the business though.
I also suggest you give the birch we have in the area a try. I take the bark off and I think it's just fine.