Well, yesterday Josh and I decided that we were going to be do-it-yourself kings and build the ringlight described here . Well, it wasn't that easy, and it took us about 7 hours and two trips to Home Depot to get it right. We ended up using a 9 in drain with a 3 inch pipe for the lens on the inside. We're still having some mounting problems with the bracket, so I'm shooting with it handheld at the moment, as to make the L brackets work, we'll have to enlarge the hole at the bottom for my flash some first. That's Josh hard at work with the Dremel in the photos. It's definitely a tool-intensive task, and would be near impossible without at least a Dremel and jigsaw.
Note the removed square sides from the drain that we picked up at Home Depot. The final product is covered with translucent paper from Staples, but we talked about getting some plastic-type covering that would hold up to wear and tear better. As it is, I can see myself replacing the paper every few months.
What else, the inside is lined with aluminum tape to maximize the light output, and the paper is attached (at the moment) with glue from a glue-stick, of the kind you would find in any third-grade class.
E-mail me with any more questions, I'd post my actual receipt if I could find it, but the total was around $40 for each of us.
Check out Josh here.