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So, I've bought everything available at the Black Market in Sanctuary but enemies still keep dropping Eridium. It's gotten to the point where my HUD no longer displays my total Eridium count whenever I pick some up.

Is there something else I can spend my Eridium on?

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You can use eridium to fight several of the late-game raid bosses. From the borderlands wiki article on eridium, the raid bosses requiring eridium are:

Note that some of the bosses can be fought multiple times without having to re-pay the eridium fee.

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Nope, Hyperius, Pete and Gee need to be paid once, too. Once you leave the arena and step, like, 10 paces outside, the boss respawns. Almost impossible to do with Gee, though, because if he dies to acid instead of weapon damage, it doesn't count - the door doesn't open, the challenge doesn't go up. – Orc JMR Mar 22 '13 at 19:35

Tiny Tina's Assault on Dragon Keep DLC added a another good use for Eridium.

In Flamerock Refuge, visit the "Moxxi Grog & Girls" tavern. Inside you'll find two "Wut Wuuut" slot machines that run on Eridium.

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And spinning 3 vault symbols on these gives a pearlescent weapon – Kexlox Jul 17 '13 at 20:34

To add to the answers prior to this one:

In the Tiny Tina's Assault on Dragon Keep DLC, at the cost of 2 eridium, you can activate shrines that give you various temporary bonuses: ammo, defense, melee, damage and speed bonuses.

Also, in the TTAoDK DLC, you can give 5 eridium to the queen* after you've rescued her (finished the final story mission).

She can be found in Flamerock Refuge. She has a chance of giving you a weapon whose rarity is either: green, blue, purple, a Hyperion E-tech Dart or Spiker, or a legendary weapon. There is also a small chance that she will produce a health pickup or ammo instead of a weapon.


* By queen, I mean Butt Stallion. And by "giving eridium to the queen" I mean feeding Butt Stallion eridium, and by the queen "giving you weapons/health/ammo", I mean Butt Stallion pooping or vomiting those out. More info here.

In the Ultimate Vault Hunter Upgrade Pack Two: Digistruct Peak Challenge, you can use them to activate 'digistruct' loot chests for 5 eridium.

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