code: public function getLowestOfferListingsForSKU($request)
      {
          if (!($request instanceof MarketplaceWebServiceProducts_Model_GetLowestOfferListingsForSKURequest)) {
              $request = new MarketplaceWebServiceProducts_Model_GetLowestOfferListingsForSKURequest($request);
          }
          $parameters = $request->toQueryParameterArray();
          $parameters['Action'] = 'GetLowestOfferListingsForSKU';
          $httpResponse = $this->_invoke($parameters);
  
          $response = MarketplaceWebServiceProducts_Model_GetLowestOfferListingsForSKUResponse::fromXML($httpResponse['ResponseBody']);
          $response->setResponseHeaderMetadata($httpResponse['ResponseHeaderMetadata']);
          return $response;
      }
docs: Get Lowest Offer Listings For SKU
  Gets some of the lowest prices based on the product identified by the given
  SellerId and SKU.
  
  @param mixed $request array of parameters for MarketplaceWebServiceProducts_Model_GetLowestOfferListingsForSKU request or MarketplaceWebServiceProducts_Model_GetLowestOfferListingsForSKU object itself
  @see MarketplaceWebServiceProducts_Model_GetLowestOfferListingsForSKURequest
  @return MarketplaceWebServiceProducts_Model_GetLowestOfferListingsForSKUResponse
  
  @throws MarketplaceWebServiceProducts_Exception