Amazon.com: Behringer Guitar Link UCG102 USB Audio Interface : Musical Instruments
IK Multimedia - iRig 2
USB Guitar Link software bundle Guitar Rig 2 - Hackster.io
Guitar Rig 5 is currently free if you buy an audio interface from Native Instruments. The cheapest one is $109 so you can save $90 if you just buy an audio interface
Native Instruments Guitar Rig Mobile | Sweetwater
Guitar Rig Pro 5.1.0, Stand Alone, Full Version Digital Download, Windows Only. | eBay