You can pick up the US spec stuff on ebay for about £5 for 100ft. I know it's the same as supplycaptain sells as I've bought both.
I went through a stage of buying loads of paracord about 12 months ago and tried loads of different sources. The US stuff is okay but not a patch on the proper stuff we used to get over here a few years ago.
What I call proper paracord is much stiffer and durable than the US stuff, less prone to tangling and less stretchy too I've found.
I've still got some bits left which I got from Kev at Endicotts about 3 years ago, I'll try and dig it out and do some comparison pics. The macro is pretty naff on my camera but I'll try and show the different texture and weave if I can.