To get only configurable products (since you need to update PRICE) below is the code:
$configurableProducts = Mage::getModel('catalog/product')
1 //key in your store id which I am guessing to be '1'
To save each configurable product below is the code:
foreach ($configurableProducts as $_product)
//This is not the best practice to load Model inside a FOREACH loop. However, this is going to be a standalone SCRIPT.
Quickest / Simplest script.