[jimktrains2]

As someone else pointed out 2.75%-2.9% is common, often thre is a charge per transaction too (on the order of 25cents after it's all said and done). The fee can change based on the card type (the merchant pays a higher fee on rewards cards normally...someone has to pay for rewards!) and international purchases can have additional fees. Charges backs can also bump up fees, ditto for outsourced fraud protection.