Four years ago, I had to buy black tights in March in Scottsdale. Let me tell you, finding tights in March in Arizona is no small task, but I wound up purchasing these black opaque tights from Express. (Heads up, they're a lot more opaque in real life than in the Express store photo!) I bought two pairs, and I've worn them all the time for the past four winters, and they've lasted and lasted, which is saying something, since I'm the clumsiest person I know.
I've seen them in-stores, and they're almost always on a buy 1, get 1 50% off promotion, which brings the price down to a bargain price of $12, give or take. I finally replaced mine this year, when they met the demise of me tripping and falling, and the second pair got a little too close to my velcro rollers, but other than that, they were still in great shape! I'd highly recommend these, if you're looking for the best black opaque tights on a budget- considering I rarely wear navy tights, and I've replaced my $8 Target brand tights three times since I've bought these, it's an investment worth making!