Different shipping $ for west coast
This is not an answer, just advice: Drupal 6 has been unsupported since February of 2016 - close to 4 years now. I strongly suggest you spend your efforts upgrading to Drupal 7 right now, if nothing else because of all the security fixes (which are super important on an e-commerce site!).

The D6 -> D7 upgrade is relatively easy to do for most sites. I do not recommend going directly to Drupal 8 right now because that will be very long and painful process especially if you have little Drupal experience. If you want to move to D8, it would probably be easier to rebuild the site from scratch.