One of the cooler vanity items you can get in Wrath of the Lich King is the Iron Boot Flask, which turns you into an Iron Dwarf for 10 minutes every hour. Currently it only costs 10 Relics of Ulduar (an item that has a chance to drop off of anything in Storm Peaks), but that's going to change in patch 3.0.8. The Relics themselves are losing their current Soulbound status, but the Boot Flask will cost a jarring 250 Relics of Ulduar.
That price makes a whole lot of sense for an item like this, to be honest. Similar items, the Orb of the Sin'dorei and the Orb of Deception are both pretty rare. It's unusual that this one was so cheap, but it's probably a side effect of the item originally only having one charge in earlier incarnations of the item. Nowadays it has infinite uses but with a cooldown, so that higher price is deserved. You still have a chance to get it before the price change, and I really recommend you do. Especially when you consider the other change coming to the Relics and the Sons of Hodir.