How to get URL from very first product at amazon search results?

Is there an easy way to get the very frist product (which is in most cases the product you would expect for the used search query) that is listed in amazon's search results?

The easiest I could imagine would be a specific amazon "search url" that automaticaly redirects to this, most related product. Is there something like this?

I think basically what I'm looking for is an easy way to convert keyword to ASIN.

Idea / expertice anyone?

If you need any kind of amazon seo help ping me
skype: kamal.eee