where to buy a good calling card to Norway?

What is a Good Calling Card,Calling to NORWAY?
I usually buy Diamnond TEXAS $5 card,but it only gives me like 25minutes to talk for,calling from Houston to NORWAY.
(I buy this card from the convenient stores/gas stations)
If you know a a card that would give me more minutes TO NORWAY,I’d like to know??
how to choose a calling card,which calling card is the best for you.Also they have done a research of many calling cards online.Which maybe the best for you.Hope you can find your answer.Buy a right calling card,save a big money.