Last year was so easy. I ordered 1,000 dollar coins every few days and had no problem meeting the minimum spend on any credit card. This year is a little more challenging. Some people are using WilliamPaid to pay their rent or mortgage for a fee. Personally, I find it way too expensive.
To me, a better choice is Amazon Payments. You can send up to $1000 per month to a friend using your credit cards. Yes, you could try to get around the $1000 limit, but lots of people who open multiple accounts are getting shut down. I play this one safe by (1) Sending smaller payments, and (2) Sending them to people with a different last name.
