If you buy 2-year 24-credit subscription, your per-title cost drops to about that $9. And that means you can wait until 2-for-1 sales and have lots of credits t

If you buy 2-year 24-credit subscription, your per-title cost drops to about that $9. And that means you can wait until 2-for-1 sales and have lots of credits to benefit from. Also, if you try to unsubscribe, they sometimes offer a much-reduced rate per-book :-)