The only thing that comes to my mind right now is repricing software that will track the activities on the eBay/Amazon and adjust your price based on your competitiveness. But if you only want to track inventory, I suppose you would need a specialized scrapper that will periodically check for changes on your competitor's account.
Terapeak.com is the software that has many functions including the history of sales of your competitor, sale through, average price and many other things
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