title: How to change shown price of a configurable product when filtering by size
body: <p>I have a problem whereby I have set up configurable products, lets say t shirts in small, medium &amp; large, with different prices for each size. </p>
  
  <p>On my t shirt category page the price shown against each product is for the cheapest size (single). </p>
  
  <p>If the user filters to show double, the price shown will still be for the single. How can I show prices for the double? (I do need to have products set up in this configuration, otherwise I would use simple products in each size)</p>
  
  <p>Thanks!</p>