Cap Bay carries some. Might wanna call ahead first though to check.
They are a high quality test kit and you can't go wrong with them.
Probably better to order online though, if you don't need them in a hurry. That way you can order exactly what test kits you need and get them shipped to your door. I made the mistake of driving all over the place, checking multiple LFS, just to see they either didn't carry them, or were sold out.