/**
  * Returns the price for the product in the PriceGroup
  * If no special price is found then the sales price is returned instead
  *
  * @param  integer $groupNo
  * @param  string $productNo
  * @return float
  */
 public function getPrice($groupNo, $productNo)
 {
     return $this->client->PriceGroup_GetPrice(['priceGroupHandle' => ['Number' => $groupNo], 'productHandle' => ['Number' => $productNo]])->PriceGroup_GetPriceResult;
 }