I put these on my Christmas list because they aren't super pricy but have good reviews. I can't report on the quality yet (I'm still stuffing myself into my old tights).
jjwritergirl I just realized- when you say "tights," do you mean pantyhose, or leggings? The H&M ones I mentioned are pantyhose. For leggings, I bought a pair from the Gap on sale for about $18. They are sooo soft and comfy, I highly recommend them.
I'm wearing some today because they were the only ones I had that weren't pilling at the feet and I was wearing pumps to work. I think they're from Kohls. That said, they are ridiculous at this stage of pregnancy. They're all the way up to my boobs and are still rolling over. I like the suggestion oh thigh highs above.
I got some from Thyme ($22) and some from walmart ($12) - both are the same so save your money. I do find, as did some others, that the waistless band falls down the whole time but I fixed it by using my bella band over the top.
I have these from Target and even thought they aren't maternity, the front comes up way higher in the front than in the back. Get the L/XL - they run really small.