The online cost (with direct credit card payment throught Blizzard website) it's a much better deal, here is the prices (Sept. 8, 2005) :
1 months = 14,99$US / 17,91$CA
3 months = 41,99$US / 49,64$CA (16,55$CA/month)
6 months = 77,94$US / 92,14$CA (15,36$CA/month)

So, if you take the 3 or 6 months package, you get a lot more for your money. World Of Warcraft prepaid cards are only good for gifts or for people who don't have access to credit card payment.

I feel sorry for those people that actually order this item.