They seem to mostly be at Disneyland, since Harveys is based out of California (this is what makes me think they won't ever do a runDisney bag, unfortunately - at least not for the WDW races

- but I would be all over that!). I *think* they may have some at Trend-D in Disney Springs, but I'm not totally sure. I know that they have some at the outlets in Florida as well!
And they are on their website at shopharveys.com
But most of mine have been purchased on Facebook (some of the retired styles - such as the one in
@twinsouvenirs avatar

).