Sticky me if you want... We have a giant system in place for generating "static" look-and-feel pages that are done entirely dynamicly. We also cache results for the high speed sites. The next rev won't even have meta data in the URL.
It is possible to implement this with osCommerce so long as the server is configured correctly. I recommend doing a google search for web hosts that offer osCommerce and asking them if they can set this feature up for you. This may also be possible with RedHat interchange but I'm not sure yet.