PhotonWrangler
Flashaholic
These showed up at Home Depot recently and they look kind of interesting. They require the fixture to be required to bypass the ballast so they contain their own driver that runs directly off the incoming AC. They come in 3500k, 4000k and 5000k. I'm thinking of trying out the 4000k version.
And the manufacturer is based in Michigan, another plus.
And the manufacturer is based in Michigan, another plus.