SellerListingLookup and SellerListingSearch cannot use any of the offer response groups. So, the following techniques are used to determine the availability of items sold by sellers:

The SellerListingSearch parameter, OfferStatus, has two valid values, "Open," the default, and "Closed." The "Open" value restricts the items returned to those that are available. The "Closed" value returns items that are currently unavailable.

The SellerListing response group, which is one of the default response groups for SellerListingLookup and SellerListingSearch, returns the element Status. If the value of it is "Open," the item is available.

Part of the values returned by the SellerListing response group includes values for Quantity and Allocated, as shown in the following example.

<SellerListing>
  <ExchangeId>Y01Y1679802Y5496404</ExchangeId>
  <ListingId>0829W011414</ListingId>
  <Title>Incredible Journey,Quad Movie Poster, 40" x 30",1963</Title>
  ...
  <Status>Open</Status>
  <Quantity>1</Quantity> 
  <Availability>Usually ships within 1-2 business days
  </Availability>
  ...
</SellerListing>

This response shows that the seller has one (the value of Quantity) of the requested items.