Check out Danco.net. They have a shop in Arcadia which another Calgunner has used for 80% and 100% lowers. They also have Ontario and somewhere else, but not sure what their policies are.
Very slow on email so suggest to call.
Otherwise A to Z in San Diego (only for 80% unless you want to wait) and someone else down that area too. Their minimum batches are a bit higher ($90).