Make a political donation ... on the campaign trail
You probably know that many politicians accept credit card donations via their campaign's official Web site, but thanks to these plastic card readers, they can also accept funds after a candidate speaks on the campaign trail. Reports have surfaced that the Obama and Romney campaigns are using Square while stumping, and GoPayment issued a press release just this week targeted toward getting campaign managers to use its application to accept political donations as well.

Buy goods at a flea market
Card readers have also made it possible for small merchants to accept credit card payments at flea markets and local craft fairs. Yelp reviews indicate several flea markets in New York City feature vendors that will accept your plastic payment methods.

Post bail
Certain municipalities will allow you to use a credit card as collateral for a traffic ticket, says Chris Mettler, founder of CompareCards.com. The card essentially serves as a bond that prevents you from losing your license while you wait for your court date. Other cities will also let you post bail with a credit card, according to CreditCards.com, although there are often heavy fees attached to doing so.

Pay a parking meter
More and more, cities are adding credit card readers to their parking meters, including, most recently, uptown Minneapolis, Minn., San Luis Obispo, Calif. and Bethlehem, Pa.

The card readers can be advantageous to those who can't find any change in their pockets (or in between their car seats), but Woolsey says "it's more of a money-saving thing for a city" since they no longer have to send anyone out to collect the quarters.

Get through a toll
Many states allow drivers to link a credit or debit card to a service such as E-ZPass or PlatePlass, which allow them to zip through a toll and pay collectively with a credit card at the end of the mouth. But according to Woolsey, many states are moving closer to limiting alternate payment options in another attempt to save money.

Get food from a vending machine
Similarly, you can also increasingly buy soda and snacks from local vending machines with your credit card. In Pennslyvania, for instance, you can buy wine from a vending machine using plastic payment methods.

Give a tithing to your church
Another thing Arnold advises against charging is a church tithing or other charitable donation, which has also become more available in the past few years. You may be better off putting that on your debit card. A company named SecureGive actually markets a line of kiosks and mobile apps to pastors designed to help their churches accept credit and debit card donations.

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