We are currently running Drupal 7.21 and the Ubercart 7.x-3.3. We are currently in progress of building a Drupal site that will be used in the sale of precious metals such as gold and silver. The site will require that all gold and silver prices are gathered from a real-time feed and continue to update as the market price changes. We have two categories, gold and silver, and two sub-categories for each, gold bars, gold coins, silver bars, and silver coins.
What we're looking for is someone with previous experience implementing such a set of features as we plan to launch rather soon.