I have afo's that help tremendously with foot drop. They are through Hanger, a company that specializes in this stuff. The brand is Ossur. They are made of a very light carbon material. The way they are made, makes it so you have some "spring" back in your step. They also had braces for ankle instability.
In most cases you will need a rx from your doctor. For insurance purposes, they are considered "durable medical equipment" .
They are very light, can be worn inside of normal looking shoes--no need for special shoes. They have made a world of difference for me.