A few weeks back there was a bit of dialogue about making payments (to Hat box)that remain anonymous and protect payer from other exposure (e.g. credit card statements). There are pre-paid credit cards (Visa, Mastercard intended as gift cards) that can be purchased with cash at a variety of outlets. These can be used on-line e.g. with Amazon. These will provide sufficient curtain of privacy or limit financial exposure when dealing on-line for one off transactions. There is a small charge for the card but the simplicity makes it worthwhile.