Users import their data into BookTrakker, which also can upload listings direct to Amazon.com. This solution is oriented towards booksellers with books that never had an ISBN.
After importing their records into BookTrakker users can then open up GrabIt, which is a plugin that ships with BookTrakker, and after doing some easy setup, they can start matching older stock against Amazon's BASIN database so they can list these books in Marketplace.
The advantage of GrabIt over using Amazon's bulk matching method is twofold:
1. Accuracy. GrabIt is close to 100% accurate.
2. Control. YOU are in control of the matching, YOU decide which ISBN or BASIN to use for your records.
It is a well known fact that many older titles command much higher prices than the usual run of the mill ISBN books, and because Amazon has such a large fixed price customer base, being able to offer older stock to them imparts a large advantage to the out-of-print bookseller.