He does not. Mab probably has it.
Yes he does. It was returned to him in Cold Days; Harry remarks that it's the one piece of magical equipment he has left.
Chapter Two, page 17 on Nook:
The other one held my mother's amulet.
It was a simple silver pentacle, a battered five-pointed star bound within a circle, on a simple silver chain. The pentacle's center was filled with a small red stone, cut to size. I'd once fastened the gem into place with hot glue. Apparently Mab had sent it to a genuine jeweler to attach it with something more solid. I touched the stone gingerly, and could instantly sense the energy within it, the psychic journal of my late mother's travels.
IIRC the price was different for everybody and Lea did not predict only give an example.
Yes, the price was different for everybody, and Lea was giving an example, but it's interesting nonetheless that both used the same example.