The popular Square credit card reader system is now available through the Apple online store. The card reader costs $9.95 and ships in either black or white and includes a $10 redemption code. To set up Square, just grab their free application from the iOS App Store and create a free account. Square takes a flat rate of 2.75% per transaction with any approved card (when swiped) and the system works with iPad, iPad 2, iPhone 4, and the 4th-generation iPod touch.

TechCrunch reports that the Apple + Square retail collaboration isn’t stopping at the online store. Apple Stores are expected to sell the small iOS credit card readers at their Apple retail stores. Maybe one day Apple will replace their thick EasyPay sleds with some Squares.

Square is the simplest way for individuals and businesses to accept credit cards. Just plug the reader into your iPod touch (4th generation), iPhone 4, or iPad and use it in conjunction with the free Square app you can download from the App Store.