Hello ...Well I am not sure about Maroc...but I use this www to buy online phone cards. I call to Algerie. So I am sure you can find ones for Maroc there too...
I personaly reccommend the Smart Middle East on page 2, Minute By Minute Billing, No Maintenance Fees and give the most minutes (at least to DZ)
http://www.ppoutlet.com/cards/Good Luck on your Visa Journey and Happy Holidays
O BTW on that www you pay open account, by entering your name, address, email, then the next day they call you to see if you are who is on the CC, then you simply order what you like then they email you the pins...
Also if you donnot want to go through this hassle ...I would suggest calling them to see if they sell them in your area...I would they sell them in mine and most areas in the US. They are very nice and helpful.