Anyone know where I might be able to find a large metal ring (about 8-10 inches in diameter) for Flip's ring on rope routine?

Have you tried a google search for large metal O-rings?

Yep

I use one from a set of linking Rings when I want a big one.

Uday's 6" linking Rings are heavy (which is a good thing) and big enough to have some of the advantages of big and small rings.

If you have a friend who owns a set, you might ask if you could try the single before buying (over a carpet!).

-Mary Mowder

10 inch.

http://www.amazon.com/Darice-Gold-Metal-......tal+hoop

They also list an 8 inch on the same listing.

http://www.amazon.com/Dream-Catcher-Meta......S852PW60