Electric bikes: Popular at Wal-Mart?

In an interview with Fortune, a Wal-Mart honcho talking about the holiday season says in passing:

Bikes are going to be big. Electric bikes are something that we’re having a hard time keeping in stock at Wal-Mart.

I poked around a (very little) bit and wasn’t able to immediately come up with any echo of this. I’m curious about it in part because electric bikes and Wal-Mart shoppers aren’t two concepts I would have matched up intuitively. I’m not sure what to make of it.