Argent Tournament Badges.
Champion's Seal is a reward from completing quests as a champion of the Argent Tournament. It is used as currency to purchase rewards from factional vendors with whom players have earned the right to champion. There are a number of daily quests that award seals.
Here you can buy Champions Seal for EU or US Servers.
You'll get guide for getting Champions Seal
You may also be interested in: Trader’s Tender Farm and WoW Gold Retail.
