Help me Groupthink, you're my only hope!

I love wearing opaque tights. The more opaque the better. Specifically, I need (need!) a pair of opaque light gray with-just-a-tinge-of-lavender tights to replace the ones I destroyed last winter. I used to get all of my tights from the "unsellable" bin at the thrift store where I worked, but alas! I don't work there anymore.

Where do you get nice, thick, sturdy tights in a range of beautiful colors for fall and winter wear?