For me, Brooks Brothers is main source for shoe trees.
Last time I bought few weeks ago, it was marked $38 CAD, but could talk out for $33 CAD per pair with my SA.(2014 price).
If you apply corporate discount of 30% on $38 during the event, it is $30.05 CAD.
Quality is pretty decent, fits well with Alden, Carmina and AE.