On amazon. Because of my Corsair PSU I was stuck with having to overpay for these (if I didn't want to pay out the ass to have a set custom sleeved or do it myself). They're not bad and definitely better than the cables that came with the PSU, but they're definitely not top of the line and at ~$100 (because you have to purchase the 24pin cable separately) they should be a little softer and more pliable IMO. There are definitely better options out there, but for simplicity sake, I went the cookie-cutter name brand route.