Amazon.com: Ibanez Nu Tube Screamer Overdrive Pedal : Musical Instruments
Guitar Pedal X - GPX Blog - Vox's Valvenergy NuTube Mystic Edge AC30 style and Copperhead Drive JCM800 style Overdrive / Preamps are fairly decent budget options for those genres
Vox Valve Energy Copperhead Drive Pedal W/NuTube – Chicago Music Exchange
Design of a Korg Nutube Amplifier Part 2: Prototype
Vox VESD Valvenergy Silk Drive Analog Distortion Pedal w/ NuTube