The mail order is L'eggs, Hanes, Bali outlet. I think if you do a search under one hanes place it will come up. Their definition of imperfect, is slightly crooked seams, etc. So don't worry that it will be the wrong shade, or had a run in it already, etc. They also stock bras and undies, pjs, sweats, slippers, etc.
I'm another one that uses a lingerie bag in the washer if I wear a lot of them. I used to wear hose most days to work, but now we're business casual. So if I'm only washing one pair, I just throw it in the washer and hang it on the rod to dry (I have a shelf w/ rod right above my washer, so the water drips into the washer). They probably don't last as long, but I'm not wearing them as long anymore.