title: Add value to final getPrice() figure within magento
body: <p>At the moment I am able to change the value of the "getPrice()" function within magento using the following code:</p>
  
  <pre><code> $price = 19.99; 
   $_rate-&gt;setPrice($price); 
   $_rate-&gt;save(); 
   $_excl = $this-&gt;getShippingPrice($_rate-&gt;getPrice(), ...)
  </code></pre>
  
  <p>This effectively means that it calls the finalprice to be 19.99. However, I need it to be able to add the 19.99 to the final price instead of overwriting it all together so instead it would effectively be:</p>
  
  <pre><code>$this-&gt;getShippingPrice($_rate-&gt;getPrice() + $price, ...)
  </code></pre>
  
  <p>however i am struggling with this a great deal. </p>
  
  <p><strong>Just to note</strong>, i appreciate how using the "save()" method is overwriting the final price, its just i am not sure how to get around it! Thank you in advance for any help!</p>