My New Favorite Place to Stalk Stockings
This vendor doesn't have the seamed garter stockings I need, but s/he does seem to be enjoying selling unflattering old nylons more than anyone should.
Deedeebon's Vintage Pantyhose Web Store's Gallery of Goddesses aka their "Ho Museum" (maybe the URL was supposed to be HoseMuseum.html and it's just a lucky abbreviation).
And check out this shop's "Sultry Canadian" hose, with a cover picture the vendor describes as "crime-scene-ish" -- on the $5 hose page.