We’ve known for a while that the day was coming, and now it’s here. Effective yesterday retailers will no longer be permitted to sell most incandescent lamps (which includes halogen lamps) in the U.S. There are some exceptions for things like bug lights, but not many.
Replacement lamps for sale now must produce at least 45 lumens per watt, which is easily achieved by LEDs but impossible with incandescents.
The Department of Energy estimates that consumers will save about $3 billion per year. ( Of course, this assumes they buy quality lamps that don’t fail within a year, which is a real problem with off brand, and even some name brand, lamps.)