Define affordable.... I see here that they have a PHP toolkit, http://www.imiscommunity.com/php_toolkit_talked_about_at_innovations so it should be childsl play to create an authentication plugin based on the gmail/openid/whatnot plug ins so that Joomla users would use their IMIS passwords to log on.
However, at the same time it seems to be wrapped up in some specific project so getting it might be difficult. However, there is what looks to be an open source Drupal module, http://drupal.org/project/imis_auth for doing that - so it would be possible to lift the code from one to place it in the other. Basically, I see more time spent going through the drupal module code and setting up FTP and testing environments, than the time that would be spent actually coding the plugin for Joomla.. That could be...1 hour....it could be 3 days...it all depends on how organized you are with all the data at your fingertips and just needing a nudge, to having to ask 50 questions to get ftp, test account, etc before finally writing the 3-4 lines of code needed.
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