Cor

Col (コル) is the form of currency in the world of Sword Art Online. When players sell items to NPCs, the Col is listed under the market price, so as to not produce inflation. The valued currency of Sword Art Online is gathered swiftly from boss battles, as they yield a large amount of valuable loot, but the loot is usually shared among all participants of the boss battle. Other methods of acquiring col include killing monsters in dungeons or open fields, selling fruit that drop from trees (not a very efficient method, but it is favored by those who refuse to battle monsters), trading, Monster PK, and for orange guilds and players, ambushing other players and stealing their items and money in exchange for their lives.

Col can take the form of physical coins. It is currently unknown how many types of coins exist in the game.

List of Known Pricing

 * 1 Col - The cheapest dry and unrefined black bread purchased from an NPC bakery.
 * 5 Col - Dropped fruit from trees at the Starting City.
 * 10 Col - The price for an NPC to lead a player to the plaza of the Algade if they are lost.
 * 50 Col - Rent a room in a First Floor Inn for one night (~100 square ft or 6 jō tatami mats). Comes with one bed and a table.
 * 80 Col - Rent the second floor of an NPC farmer's house in Tolbana Town for one night. Comes with two rooms, a large bed room with a good view, a bathroom, and free milk.
 * 16,000 Col - The price of a new Anneal Blade +0 a few days after the first floor was cleared.
 * 100,000 Col - Estimated minimum ​purchase price for the rare Ragout Rabbit's Meat from another lucky player (such as the meat Kirito obtains with a Throwing Pick).
 * 1,000,000 Col (1 Mega Col) - The cost of a glass of rare wine, after the drop rate of the wine was patched.
 * 3,000,000 Col (3 Mega Col) - The cost of a support-class small house with a waterwheel in Lindas.
 * 4,000,000 Col (4 Mega Col) - The cost of Asuna's furnished house in Selmburg.

Trivia

 * Col is an abbreviation for "coin of radius", which most likely means "currency of Aincrad."
 * In the 4-koma manga, the spelling of the currency was COR.