title: Programmatically changing cart totals in Magento
body: <p>I'm in the process of building a rental site based on Magnento with all of the rental options (date, duration, etc...) configured on the cart page.  As all of the products are coming into the cart without pricing, once the options are set the grand and sub totals for the quote need to be updated before moving on to checkout.  Any thoughts?  Thanks in advance!</p>
  
  <p>The site is <a href="http://replikavintage.com" rel="nofollow">http://replikavintage.com</a> for the record...  Just get to a 404 to advance past the splash page.</p>