Lowest price 2x Barlow Lens 1.25", SkyWatcher 2x Barlow Lens with inbuilt T Adapter 1.25" - YouTube
Amazon.com : SVBONY Barlow Lens 2X, 1.25 inch Barlow Lens with Multi Coated Broadband Green Film, Telescope Accessories with M42 Thread for Telescope Eyepiece : Electronics