Whada ya mean, why carry those too?
I'd call and put the question in a managers hands and tell them you'll callback. I have seen the jumpers in either Lowes or HD, but that doesn't mean they carry them at every store, or at all anymore.....it also doesn't mean they haven't been moved to the paint department
I'm sure you could find them cheaper, but in a pinch for an odd part like this Grainger is a good place to start. There used to be enough manufacturers represented to cover just about anything, and if they didn't have "it" they often knew who did.