Disclaimer: I'm unaffiliated with all of the companies listed below. I just want them to succeed because they are doing interesting work. Sorry in advance if my language is market-speak.
Sip & Ship <http://sipandship.com/> and Best Service & Repair <http://www.bestserviceandrepair.com/> both accept Dwolla <https://www.dwolla.com>. With Dwolla, it's easier for customers to pay and the businesses get more money. It's easier to pay because customers can use the Dwolla mobile app right on their phone. The businesses gets more money because Dwolla's fees are *significantly* lower than those of the popular credit card processors. There's no fee for transactions under $10, and a $0.25 flat fee otherwise. Support your local businesses by making your next purchase with Dwolla!
Other mobile payment systems like Square and LevelUp are indeed interesting, but both support legacy payment processors that charge businesses hefty fees.