I just did a little research on these. Is perfectly fine, but I will not do it. They want the card ahead of time because there is a fee per bid and you pay it ahead of time as a bundle. Basically, you pay for 100 bids and so on. Each time you place a bid your number of bids left is reduced whether or not you win the item. You need to be the last person to place a bid before it closes to win it. I guess is fair, they need to make their money somehow. You then pay for the item you just won. The deals seem amazing. I guess you could use Paypal for the purchases, but I stopped the registration process before I got there. Is not easy to get my credit card number from me.