The VariationSummary response group provides the lowest price, highest price, lowest sale price, and highest sale price for all child ASINs in the response.
Parent ASINs do not have offers; their children do. For example, you cannot buy a shirt (the parent ASIN). You can, however, buy a shirt that is a certain color and size and is made by a specific manufacturer (the child ASIN).
Sample Response (REST)
<?xml version="1.0" encoding="UTF-8"?>
<ItemLookupResponse xmlns="http://webservices.amazon.com/AWSECommerceService/2005-10-05">
<OperationRequest>
<HTTPHeaders>
<Header Name="UserAgent" Value="Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"/>
</HTTPHeaders>
<RequestId>0R6G71MRKKAJCKAMWSES</RequestId>
<Arguments>
<Argument Name="MerchantId" Value="All"/>
<Argument Name="Service" Value="AWSECommerceService"/>
<Argument Name="AssociateTag" Value="[Your Associate ID Here]"/>
<Argument Name="AWSAccessKeyId" Value="[Your Access Key ID Here]"/>
<Argument Name="ItemId" Value="B00006XYAA"/>
<Argument Name="ResponseGroup" Value="VariationSummary"/>
<Argument Name="Operation" Value="ItemLookup"/>
</Arguments>
</OperationRequest>
<Items>
<Request>
<IsValid>True</IsValid>
</Request>
<Item>
<ASIN>B00006XYAA</ASIN>
<VariationSummary>
<LowestPrice>
<Amount>1450</Amount>
<CurrencyCode>USD</CurrencyCode>
<FormattedPrice>$14.50</FormattedPrice>
</LowestPrice>
<HighestPrice>
<Amount>1750</Amount>
<CurrencyCode>USD</CurrencyCode>
<FormattedPrice>$17.50</FormattedPrice>
</HighestPrice>
<SingleMerchantId>A3BHV8OQ3W90PJ</SingleMerchantId>
</VariationSummary>
</Item>
</Items>
</ItemLookupResponse>
The Request that Generated the Response (REST)
http://webservices.amazon.com/onca/xml?Service=AWSECommerceService
&AWSAccessKeyId=[Your Access Key ID Here]
&AssociateTag=[Your Associate ID Here]
&Operation=ItemLookup
&ItemId=B00006XYAA
&MerchantId=All
&ResponseGroup=VariationSummary