Philips has "SceneSwitch" bulbs which are NOT 3-way lamps, but sort of approximate the 3-way behavior: When you toggle the power off and back on again within <1s, they'll cycle between bright, medium, and dim. (With color temperature becoming lower as you dim.)
I've made these my standard lightbulb for any non-dimmable lamp/fixture, so pretty much every light in my house can be dimmed now.
(Any fixture attached to a dimmer gets Philips "Warm Glow" bulbs, which also get warmer as you dim them, and which do a good job of filtering out flicker.)
(Yes, I know I could search online and order them. It's not that important.)