This is a hot deal for a very few select people.
Amazon has ATE brand brake rotors from $6.10 each. The catch is that it's a very limited selection.
So, to see what they have, click
this link.
Here's a PDF with all the part numbers listed. Open the PDF and do a text search on the part numbers from Amazon to see what they fit.
From what I saw, there were rotors for Audi, Toyota, Volkswagen Passat, Ford Thunderbird/Mercury Cougar, Mazda 626, Nissan 350z and more.
So, it'll take some leg work, and you'll have to have the right car, but you'll get $50-$100 rotors for $6-$20 with free shipping on $25+.
There's also only 2 or so left of most of these, so it's first come first serve.
Using the Amazon parts finder for your vehicle will
NOT bring up these cheapies.