Tascam iXZ | Mic/Guitar Interface for Smartphones And Tablet Computers
IK's iRig 2 iOS/Mac Guitar Interface now under $30 for limited time at Amazon (Reg. $40+)
Amazon.com: IK Multimedia iRig 2 Portable Guitar Audio Interface, Lightweight Audio Adapter for iPhone, iPad and Android Smartphones and Tablets, with Instrument Input and Headphone/amplfiier Outs : Musical Instruments
IK Multimedia iRig HD 2 Studio-Quality Guitar Interface for iOS – Chicago Music Exchange