My parents recently moved to Guantanamo Bay, Cuba.  I am looking for
the cheapest calling card rates available to call from the U.S. to the
base in Cuba and how to acquire the cards.

Also my brother lives in Grenada, and I am looking for the cheapest
calling card rates for that country as well.

Thank you for your help, Best Regards

I found that Cards that are from Canada are actually cheaper and have
a better minute rate. I would start by searching out known card types
for there respective website which usually lists a
minute/country/location chart. For example...

http://www.goldline.net/rates.asp
http://voxdirect.ca/eng/index.htm

While this is NOT the best cards from the US, its a very good rate
from Canada. The do offer International cards,  Which may help, or
give u a better rate than your getting now. I get over 250 minutes
from Canada to the US for $5 to call my g/f in Florida. The best cards
she can find offer her 30 min to 45 min for $5. Walmart cards, and
re-loadable cards are the worst it seems. So there is one answer to
your question, rates change, and theres often promos, like VOX u get
an additional 10% for using 2 cards in a 30 day period. At best VOX
offered over 500 minutes for $5 for me, now i get about 268 min with
"OLA".

Keep in mind this is for one single call (max minutes). Often cards
charge a daily fee, and/or a connection fee thats deducted from the
card.

Robert Lockrey