Assuming you are too broke to buy your own/too young to have a credit or debit card- Find old lady with a purse. Knock old lady down and steal purse. Head to nearest grocery store/Wally World/super big box mega mart. Buy iTunes card with money out of old lady's purse. Use iMoney to buy ec. Lay low, man, don't make a big deal out of it. Gotta avoid tha police.