Open question: I am African, but can receive I US franked debit map?

I white, all you to think can that I am moved, but I really this debit map need. I cannot seem to buy my music instruments of memory in the USA because they would not accept debit map of my country. My country does not use credit card, therefore we do it the old-fashionable way, but them do not help me in each regard? Can someone fallen (I please), does explain to me, where I can receive franked debit maps for international users or everyone, who can help me to request one?