E&G is good and local.
I picked up the kit of Weather-tite connectors from Summit a while ago. I don't use a whole lot of them, but I periodically restock it.
Besides Parts Express there is Waytek and Delcity. I've also used Wiring Products, which is smaller.
"Stand your ground. Don't fire unless fired upon, but if they mean to have a war, let it begin here." -- Capt. John Parker