I have found a few out here in the desert. I found a nice iron one on the north side of Ord Mtn. I believe it was part of the trail of meteorites that ended up spreading thru Lucerne Valley. You can access Ord Mtn by using the pipeline road off Barstow rd.

Another place I found small pieces was on Coyote Dry Lakebed. You can walk the edges around the lakebed with a stick with a good magnet and find some, or even walk the lakebed itself. I'd do it in the winter months because of the heat in summer. You can access the lakebed from dirtroads that lead NW behind the old Lake Delores, or from Irwin Rd just past the bottom of Jackhammer Pass, along the long straight portion of Irwin Rd.

Just try to stay off people's private property.
Hope you find some..