I inquired on some AE seconds from the Destin Company Store. The responding email says that shoe trees are on sale for $16.95 each pair.
I'm not sure if the sale is a national sale, but it's enough off straight retail that I ordered a couple pair.
The toll-free phone number to the Destin store is 850-654-4790.
Edited by Mcbeck - 2/8/16 at 11:39am