In days long past, I would travel Route 22 to the trio of stores (Route Electronics, Lafayette, and Greenbrook Electronics), but alas all but the latter are long gone. Even Lashen's up in Denville has closed shop.
Since Greenbrook Electronics moved out of Greenbrook a year or so ago, into North Plainfield, and to the other side of the highway, it's greatly expanded! They now seem to have everything from surplus to Arduinos, hookup wire to test equipment, and rows of individual components to kits. It's really a totally different store. I was in there several months ago and the new store is a consolidation of at least a couple of warehouse locations -- they don't even have everything out on the floor from what I understand. Keep in mind Greenbrook is on the expensive side, but when you need that one special part *now*, they are the place to go.