Therobotmarketplace is a good place for this class of motor. They compete on some things, but honestly anything Pololu covers, they do better. A quick glance shows they have a dewalt section
I think the robotmarketplace is a better place for some of the heavier duty motors and such that Pololu as of yet doesn't do alot with.
The only place where they have more serious cross-over and competition is maybe with some of the higher power motor controllers Pololu has. i don't really know.