There was a farily prominent member here who had a nice supply of high quality connectors and cordage about a year ago or so. My C.R.S. has kicked in, so I can't tell you his name/handle.
He was selling at prices I couldn't touch at supply houses around here. I didn't buy anything from him, but hopefully he'll be by shortly and chime in.
I have a collection of self-made and purchased extension cords. The ones I made are much better, but I reach for the mfg. ones half the time -- they are lighter, and somehow end up at front end of my cord rack a lot. When I was younger, I made some stupidly heavy-duty extension cords --- silly looking back, and even dumb when I think about how I connectorized 8AWG SJO, but I have always been a bigger must be better guy.