did we need to used credit card to purchase MJ stuff?

yeah あなた need an credit card online if あなた order it offline like barnes and noble but in the store no あなた dont have to use an credit card if あなた dont want to あなた can use cash または credit if あなた go to the store

あなた need a credit card :/
My parents say that to me too so I'm gonna ask m aunt for it.

If あなた buy items in a store あなた can pay via cash (you know that of course) または with your credit card.

Online depends. Some online stores only accept credit cards and others mostly accept credit cards, PayPal, giftcards (coupons) または あなた can pay via bill. The bill is sent along with the products あなた ordered.

A site I recommand あなた is Amazon.com (or co.uk).
It is very reliable site + it has a large variety of Michael Jackson merchandise, (for instance). The price is reasonable as well.

As far as I am concered アマゾン accepts credit cards, money orders, giftcards, etc.

A little hint: It is easier to persuade your parrents in buying something when あなた are in a store. As I see あなた live in Malaysia? So it won't be hard for あなた to find an appropriate shop. Most parrents don't rely on online shops!

I hope that I could hepl あなた in a way. Good luck!
Peace, 愛 and Michael.