We are a registered 401C non-profit that had a "lifetime" Pro account as described in your blog.
http://don.blogs.smugmug.com/2007/09/27/lifetime-free-pro-accounts-to-non-profits/
It looks as if SmugMug has now removed this offer and is now only offering one-year discount.
http://help.smugmug.com/customer/portal/articles/98093
Can you confirm this is the case and that our options are to buy a Business or Portfolio account or to switch to another provider.