NEEWER LS-T11 3X Barlow Len for 1.25" Telescope Eyepiece - NEEWER – neewer.com
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
Bresser | BRESSER 3 x Barlow Lens 1.25 inch | Expand Your Horizon
Buy Levenhuk ED 3x Barlow Lens in online shop | Levenhuk - best optical equipment
APM Telescopes. Skywatcher 3x Barlow Lens 1.25" with 3 lens elements