As some of you are aware, Nashbar has started marketing their own drivetrain components, which now include brifters and derailers made by Microshift. Reports have been basically good so far, apart from some people disliking the semi-Shimano-knockoff design of the brifters.
I've been wanting to get a Shimano road rear derailer for my Centurion Ironman, setup with 9-speed STI drivetrain but using a Shimano XT long-cage rear derailer that came out in the 8-speed era. It's a very good derailer, but doesn't shift super-crisply over the 12-26 9-speed cassette, tracking further away from the cassette because it's designed to handle larger cogs, and with perhaps less precision than 9- or 10-speed rear derailers.
So I bought the Nashbar rear derailer for $30 (with 20% off offsetting shipping and sales tax charges).
I haven't yet installed it or ridden the bike, so for now I'm just attaching pictures of the box and the derailer itself. I'll post more information once I've ridden it.
The only problem is that the bottom pulley wheel turns with resistance. I'm going to open it up and clean and lube it and will report back.