a box == the game box so you can activate the account
http://www.nextag.com/World-of-Warcr...4ADDF23B480135

roughly $20. comes with 1 month free

so... you would need to get 3 accounts to become legal. 3 * $20 == $60
then, BEFORE activating, you do a recruit-a-friend from your existing account for each of your new accounts. this will save your main account 1 months fee per clone account... or 3 months, which == $45

for each clone account, in the 1st 3 months, you get the 1st month free... requiring you to pay for the last 2 months for each clone. so.. $15/month * 2 months * 3 clones == $15 * 2 * 3 == $90 total

couple the $90 with the $60 you spent for the boxes... but then subtract the $45 you save for recruit-a-friend, and you get a grand total of $115 out of pocket over the next 3 months.

doing the math, it would be about $38 per month... or an additional $23 each month over what y ou pay now for a single account ($15/month)

that's about as far as i can break it down