We recently came across Clonecom, one of the largest providers of domestic and international calling cards, and thought they would be worth mentioning here for anyone looking for an inexpensive, no frills calling card. Clonecom has rates as low as 1 cent per minute. They work a lot like SpoofCard as well, where you get your calling card information via email right after you make a purchase. You can also refill your PIN online. Check them out!