With the ProPay MicroSecure Card Reader, there's no need to write down credit card numbers when you are selling on the road. It fits in a pocket and stores up to 71 credit card numbers, each encrypted with a different algorithm. Connect it to a computer's USB port when you get back to the office, and it will upload the payments and credit them to your account. The reader costs $149.95, and accounts start at $34.95 a year. Per-transaction charges are 3.5 percent plus 35 cents; charges drop for larger accounts.