Griffin PowerMate USB Multimedia Controller - Shuttle wheel - wired - USB at TigerDirect.com
Griffin PowerMate Multimedia Control Knob for USB Computers, Black - Assignable USB multimedia controller. {link removed} for Sale in Walnut, CA - OfferUp
Best Buy: Griffin PowerMate USB Multimedia Controller 1100-PWRMTS
Griffin PowerMate Multimedia Control Knob for USB Computers, Black - Assignable USB multimedia controller (9d17dd30e8444a57794f02ecaf6e3849) - PCPartPicker
Griffin Technology PowerMate USB Multimedia 1100-PWRMTS B&H