code: public Observable<Page<SkuInner>> listAsync() {
          return listWithServiceResponseAsync().map(new Func1<ServiceResponse<List<SkuInner>>, Page<SkuInner>>() {
              @Override
              public Page<SkuInner> call(ServiceResponse<List<SkuInner>> response) {
                  PageImpl<SkuInner> page = new PageImpl<>();
                  page.setItems(response.body());
                  return page;
              }
          });
      }
docs: Lists the available SKUs supported by Microsoft.Storage for given subscription.
  
  @return the observable to the List&lt;SkuInner&gt; object