Checked them out. The "regular" price for 1 lid holder is $25, but they have a "special" going now - 3 lid holders for $50. That's still over $15 each for some bent wire and a plastic handle.
http://lidsitter.com/
And, I'm not sure that it'd work on smaller pots, which is most of what I have. I can see it tipping the whole thing - pot, lid, and holder, over because the center of gravity is shifted outside the pot.