I'm assuming that most of the people complaining about spending 15$ a week on a card game for six weeks- already have a job.
If you don't have a job and are relying on your parents or someone else to buy you the cards- then you'll probably have to beg.
But lets assume you have a job and really need to buy these cards.
Try to look at some ways to save some money each week-
What else do you spend your surplus income on? Maybe cutting back on some other entertainment will help you purchase the cards you want.
And... if you're living check to check- maybe investing in a card game isn't the best financial decision.