Lowest price 2x Barlow Lens 1.25", SkyWatcher 2x Barlow Lens with inbuilt T Adapter 1.25" - YouTube
Amazon.com : Telescope Barlow Lenses Kit 2X-3X-5X, 1.25 Inch Telescope Accessory, Fully Metal Multi Coated Broadband Green Film Barlow Lens for Telescope Astronomy Eyepiece : Electronics