Maelstrom Crystals are a necessary material for many high end enchants in World of Warcraft: Cataclysm. With some enchants requiring as many as four or five Maelstrom Crystals, relying on the auction house for individual crystals, or hoping for unwanted dungeon loot to disenchant can be a pain. While you can still obtain Maelstrom crystals from raid bosses, heroic dungeon bosses, and disenchanting your own epics, here are three simple ways you can farm Maelstrom Crystals without breaking the bank too terribly.
Honor and Justice Vendors
While you can purchase Maelstrom Crystals directly from the honor or justice trade goods vendors, this is extremely costly and definitely not the route you should go when farming Maelstrom Crystals. Instead, you'll be purchasing Relic slot items for 700 honor or justice points. If your guild has the Bountiful Bags perk, this will give you a chance to proc extra crystals when disenchanting the relics. Whether you enjoy PvP or PvE, either method provides a way to use your points to obtain extra Maelstrom Crystals to use for enchanting.
Avengers of Hyjal Reputation Vendor
If your reputation is Friendly or higher with Avengers of Hyjal from doing the Firelands raid, you can purchase cloaks for 225 gold (minus reputation discount) from the vendor outside the raid portal in Mount Hyjal. Depending on your standing with this faction, and whether or not your guild has the Bountiful Bags perk, this can reduce your cost per Maelstrom Crystal down to about 150g.
Disenchanting Purples from the Auction House
Lower tier Bind on Equip epics can occasionally be found on the auction house for cheaper than the price of a Maelstrom Crystal. If you can find any, buy them for disenchanting. A good example of a BoE epic to disenchant is the Spiritguard Drape from ZG. This cloak is difficult to sell with many higher level substitutes easily available, so it's possible to pick one up cheap to disenchant every now and then. Keep an eye on your server's market for items such as this one, and it will help you craft enchants on the cheap by keeping your supply costs down.