Just got an anonymous tip from an anonymous reader (Lets call him Mr J). They found OS 18.104.22.168 online for the 8320. The 8320 has been having a rough time with OS releases but hopefully this latest version will work out.
One example of where 22.214.171.124 can be found is at this link:
NOTE: Do not install this software if you do not know what you are doing. It may make your BlackBerry FUBAR or just plain angry.