How to access Product List Price in Database

How to access Product List Price in Database

I have a large volume of products and am exploring creative ways using custom functions to add them to price books and assign a list prices without having to do it one by one. I can't seem to find where the list price and product-pricebook association is listed in the database.  After adding a product to the price book I expected to see the product ID and List price become part of the price book record, but it didn't.  I also didn't find a Price book ID and list price in the product record data.  Where is this information stored and is it accessible through custom functions?