wowhead, wowdb, the WoW Armory, thottbot, this site to some extent: all good for looking up items out of game. In game, if you don't mind using addons, I HIGHLY recommend using AtlasLoot. You can bring up "Level 70 instance token rewards" (pretty sure that's exact) and it will show every Badge item broken down by type (cloth, plate, relics, etc..) as well as separate the Shattrath items and IQD items. It also lists their Badge cost.
Then of course you can see other stuff like boss drops, PvP gear, etc.. if you were interested.
Edited, May 20th 2008 1:11am by Maulgak