At some point during your game play, you'll wish you had more ironite. This can be accomplished in one of two ways - farming it (slow) or buying it with real world dollars (quick).
If you decide to spend some real world dollars on ironite, the 30 day drip pack is a great value. If that doesn't trip your fancy, the bundles will give you the same amounts as some of the other pakcs, but also include some bonus souls and gold.
Keep in mind that this is a freemium game. They want to entice you to spend a few dollars here and there, eventually working up to buying bigger packs. We suggest moderation if you're going to spend real world dollars in any freemium game.