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@athaeryn eBay! search “flip dot display”. bigger ones are pricier ebay.com/itm/Huge-5-Digit-Electromechanical-Flip-Dot-Display-nixie-tube-split-flap-vintage-/272276099092?hash=item3f64eb9014:g:~h4AAOSwa-dWs5HL ebay.com/itm/Mark-IV-Luminator-Gillig-Mohawk-16x32-Flip-Dot-Sign-Rear-Display-Transit-Bus-/222087162882?hash=item33b56d2c02:g:JM8AAOSw5L9XEAgi&vxp=mtr ebay.com/itm/Ford-Bus-916-1640-010-Flip-Dot-Display-Sign-Board-with-Sensor-82-39054-000-/191879723479?hash=item2cacec39d7:g:qNkAAOSwI~VTyE6X&vxp=mtr