Is your toy r us a single store or connected to a shopping mall? As the local toys r us for where I live stocks a very small quantity of trains, and only a wee side aisle for imaginarium products. And I have searched the train area for about twenty minutes trying to locate that set and it does not exist in my local toy r us. But it's connected to a mall, so that could explain it.
Proud owner of Tomy/Plarail trains. 