Using the ItemSearch Availability Parameter

The ItemSearch Availability parameter enables you to search only for items that are available. The only valid value for Availability is "Available," as shown in the next example.

http://ecs.amazonaws.com/onca/xml?
Service=AWSECommerceService&
AWSAccessKeyId=[AWS Access Key ID]&
Operation=ItemSearch&
MerchantId=All&
Condition=All&
Availability=Available&
SearchIndex=Apparel&
Keywords=Shirt

Items can become unavailable quickly. Even though this parameter filters out unavailable items, checking that an item has an OfferListingId is still recommended.