I absolutely swear by Usenet. As long as you get on a few trackers, you can widen your net and find most of what you want. BTW, Drunken Slug is currently open to registrations. I found quite a bit of Amazing Race on there.
You’ll find varying retention spans on each tracker. Look at a few and judge from those. I have accounts on Drunken Slug, NZBGeek, NZB.su, NZB Planet, and BinSearch.