If you are looking for a simple way to pay for something anonymously, I recommend using a disposable credit card. In my experience, the Vanilla Visa credit card is currently the best option. There is no name or other identifying information associated with these cards, and they can be used almost anywhere.
Update: A reader posted this technique, which sounds useful:
What I do is I purchase a Virtual credit card from http://www.moneypakreload.com with bitcoins. With that I go on Zmazon and Zappos and buy my stuff. I have done it 3 times, and I’ve always got the credit card in about an hour and amazon and zappos processed it without any issues.
Vanilla Visa Credit Card
You can find Vanilla Visa credit cards at many convenience stores (like CVS) — there’s a full list of retail locations here. There are no fees associated with card, beyond a $5 fee at the time of purchase. You can get cards that range from $25 to $500. If you buy a $500 card, you pay $505 at the store, so you are basically paying a 1% fee for your anonymous credit.
I recommend registering your card on the Vanilla Visa website. If you don’t register, the card won’t be accepted at many stores. The registration process simply involves entering a zipcode, and nothing else. Of course, if you wish to remain anonymous you can provide a fake zipcode. You should also obfuscate your IP address while activating the card (see my article How To Be Anonymous On The Internet for more information).
Simon American Express Gift Card
Another option is to purchase a Simon Gift Card. You can get these card at any mall listed on this page. Simon Gift Cards are not reloadable, but you can load them with $500 using cash. You are not required to give out any personal information to purchase the card. However, by using their website, you can link any name and address to the card, so you can use them with merchants that do AVS checks.
Disposable credit cards are also handy if you wish to purchase online from a company you don’t know or trust. Your card will not be linked to any bank account or line of credit.