ThinkGeek.com has the iRig iPhone Guitar Interface for $29.99 (39.99 – 10 coupon) for a limited time. To get discount, use the coupon code: nextorder at checkout. Shipping adds $6.59.

The iRig iPhone Guitar Interface is a combination of an easy-to-use instrument interface adapter and guitar and bass tone mobile software. With AmpliTube iRig, you can plug your guitar into your iPhone/iPod Touch/iPad and jam anywhere with world class guitar and bass tone right in the palm of your hand. Simply plug the iRig interface into your mobile device, plug your instrument into the appropriate input jack, plug in your headphones, amp or powered speakers, download AmpliTube Free for iPhone or for iPad, and start rocking! The AmpliTube software features 11 stomps, five amps, five cabinets, two mics, tone controls, metronome, and ability to play along with music loaded onto your device.