I just got in an order from Paracord Planet. It was all Mil-Spec 550 Type III seven strand paracord. That's as good as it gets. They shipped the same day, and their prices were reasonable. Free shipping too. (I ordered a bunch)
https://www.paracordplanet.com/550-Paracord_c_66.html
Their not cheap for 100 feet. I never heard of them or seen them mentioned before.
New to this forum and new to the idea of making something with paracord. I have 100' of OD paracord I bought a couple of years ago, and have never really used any. Finding this site and watching some YouTube videos on making bracelets, I decided to give it a shot. Going from a couple of links provided in this thread, I looked at two sites. Paracord.com and ParacordPlanet. I decided to start with 50' of cord and 5 buckles. Price difference was about $0.50 cheaper at ParacordPlanet. Immaterial cost difference. However, shipping at ParacordPlanet was free. Shipping at Paracord.com was about $9. Guess where I ordered from?