I agree with EmilyG.
"Sometimes i think what kind of company doesn't accept debit cards: they are just like a credit card, perhaps even better..."
Yes, Pumpi, that is true. But not better for you. A debit card takes money out of your checking/savings account. Even if it is used like a credit card, it still is tied to a bank account. The Fair Credit Act does not cover any cards like that. Even if a bank assures its clients that it will investigate or protect them from fraud or theft, it is not a Federal Law, so they are not very safe to use online. If a credit card is stolen, you are legally limited to pay $50 in fraudulent charges, unless you have fraud protection. This is not true for a debit card. I don't know your situation, but I think PayPal has insurance if you pay through them. That way, even if you use your brother's debit card, the seller doesn't get to see his account number, so it is much safer. Visa and Mastercard offer "dummy" numbers for buying online for added protection. You just use the number once so nobody can ever buy anything with it. That's probably the safest way of purchasing online. Regarding not getting your merchandise, I wish I could help but I've had trouble and always charged back the amount.
By the way, thanks for thinking of others and posting a warning.