Most economical way to call Poland from US

MY internet is limited to 5GB per month and I suppose skype would put a big dent in it when my wife talks to her mom for a long time.

Is the best option a calling card? If so which one is best?
Thanks

Before Skype I was using Acces International and had 6 hours of talking for $5.

Try magic jack,send one to poland and they can use it and you can call unlimited for 20 bucks a year

letter in the bottle maybe?

Skype probably doesn't use as much as you think, especially if you turn off the video.

Per the thread below, your 5GB is good for 160 HOURS of Skype.

forum.skype.com/index.php?showtopic=62535

Or to put it another way, it may be cheaper to up your internet plan than to pay for a call. :)

I use a calling card from czescpolska. I pay 1c/min to call in Warsaw and i can call directly from my mobile