Unfortunately, they aren't commonly found yet in grocery stores in my area, but I've been able to pick them up when I stop at Produce Depot . I also ordered some frozen yellow and purple varieties from Schwan's recently and really liked them.
So, since I have this fascination with fingerlings, I was pleased to see them on the sampling menu at the Idaho Culinary Celebration I attended at Kendall College. Among the dishes prepared that night were a Warm Idaho Fingerling Potatoes, Roasted Beet and Tomato Salad and Curried Idaho Fingerling Potatoes. Both get a major thumbs up from me, especially the salad.
If you have not yet tried fingerling potatoes, take a peek at your local grocery store or farm stand and make a request if they don't carry them yet and if you happen to be out for a bite to eat and find fingerlings on the menu, be sure to give them a try.