Awesome unique New Credit Card Icon Pack by Graphicpeel.
This pack consists of 35 icons. Each icon comes in a 32px x 32px pixel in PNG format!
Each one has just enough pixels to remain clear and understandable, and just few enough to stay out of the way. Use them for online checkouts, your personal store, donation buttons, affiliate links, or whatever else you need them for.
Icon pack also includes some great iTunes Card icons in blue, green, red.