Shoptracker is a central management point for products and shopping feeds. This tool can update prices; manage products; change product categories; and create product feeds for comparison shopping engines.
SearchMarketingTools delivers an advanced shopping management service that goes beyond simple feed creation. In addition to creating and submitting shopping feeds, SMT has created a complete solution for the needs of shopping campaign managers. Our service will increase profits, identify advertising waste, and enhance the productivity of your online marketing department. Source
Since Bizrate and Nextag allow product level bidding, ShopTracker can identify under and over performing products and automatically decrease/increase bids on individual products. ShopTracker also displays competitor product pricing, allowing you to optimize product prices to gain top ranking positions or to close under pricing gaps.
Learn more about this tool at http://searchmarketingtools.com.