Amazon.com intergration with WordPress?

You’re looking for something a little more advanced than a simple affiliate integration. Unfortunately, I don’t thing there’s an existing plug-in solution for the kind of interaction you’re trying to achieve. That said, it should still be possible.

A cursory search turned up Amazon’s Product Advertising API, which seems to be exactly what you’ll need. It provides directly programmatic access to the Amazon product database, meaning you can find (and cache) product information and prices fairly easily.

You can use this to power a local search of the Amazon database for products or just retrieve information specific to a product based on a known Amazon ID. It’s up to you, and I encourage you read through the documentation and see if this is the right platform.