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
Guitar Rig Session I/O Interface | Reverb
USB Guitar Link software bundle Guitar Rig 2 - Hackster.io
Guitar Rig - Wikipedia
Usb Guitar Cable Recording Adapter Sound Player Card Effects Interface Link Cable Guitar Sound Pickup - Guitar Parts & Accessories - AliExpress