From

Psst, start saving up now -- permanent accounts will be available for sale sometime in the next few months. A permanent LJ account is a paid account that never expires; you guys have been asking for them a lot lately, and we're going to have a limited-time sale in the near future. We'll give you more details, including the price, as we come closer to setting a date.
See LJ News for information on all coming-soon site changes.