WordPress With Datafeed Redux

I'm using WP as the platform for a catalog commerce site. Just so we're on the same page, let me explain my goals, my current status and then my question.

My goal with this site is to simply add content which gets traffic, lets them search for a brand or model, let them view the catalog description and image the datafeed script produces and then passes them off to the merchant site to make the purchase.

I am working with a merchant and using their dynamic datafeed PHP script. I am using the PHP-exec plugin which allows me to place the datafeed PHP script directly on a post. Each post will have an edited version of the script which pulls different brands and the posts will be labeled for that brand. I've tested the script with the plugin and it does successfully pull and display the data formatted as tables on each post.

So far, so good. However, because all of the data from a brand is displayed dynamically , the WordPress search box is useless unless somebody just searches on a brand name because that is in the post title.

I've seen the other datafeed import scripts but they require a fairly high amount of customization or they're just too damn expensive and want monthly fees to use them.

My question is does anybody know how to either tweak the WP search function to be able to search a local MySQL database for the results or is there a tweak I can do to the datafeed PHP script to have it create a separate post for each item so the WP search WILL work?

I have database experience but the WP thing seems to be the tricky part.

I also know that I'm going to be told I shouldn't use WP because of these issues but I need to say that it hasn't taken much of my time to get to this point. The test site I'm working on looks and feels like a real web site. It's just essential that my visitors can search in a granular manner.

Sorry this is so long but I wanted to save confusion wherever I could by giving background.

Jeff