I am using product advertising api by Amazon. Its a little lacking to be honest, since there is no way of getting the product name. You can get the title, but that contains the offer "Amazon Kindle 3G, with free wifi..." instead of simply Amazon Kindle 3G.
More importantly, there seems to be no way of getting the stock information. I just need to know if an item is in stock or not. That's all, there seems to be no way of doing that yet. Ama I missing something. I am using the ItemLookup Api. I get some details by using the Large Response Group but no stock information
Although I am using amazon product api with a python wrapper..there is a availability parameter - checkout the amazon doc http://docs.aws.amazon.com/AWSECommerceService/latest/DG/CHAP_ReturningPriceAndAvailabilityInformation-itemsearch.html