Amazon.com : 3X Barlow Lens, 3X Astronomical Telescope Eyepieces Barlow Lens with M42x0.75mm Thread, T Ring Adapter for 24.5mm Astronomical Telescope/Digital Camera : Electronics
Tebru Lens, 3x Barlow Lens M42x0.75 Thread Interface for 1.25 Inch Astronomical Telescope Eyepieces, Barlow Lens - Walmart.com
Amazon.com : Astromania 1.25" 3X Short Focus Barlow Lens for Telescope Eyepiece - Superior Sharpness and Color Correction : Electronics
APM Telescopes. Skywatcher 3x Barlow Lens 1.25" with 3 lens elements