Canon Extender EF 1.4X III (excellent condition) - $395 in Gatineau, Quebec for sale

Canon Extender EF 1.4X III is in excellent condition. I have used it only a few times and is like new. I am selling it because I bought a telephoto lens and no longer need it. I am asking $395 (firm), which is a good deal.
The Extender EF 1.4X III (version 3 - latest version for better performance) from Canon is designed for select Canon EF mount L-series (professional) telephoto lenses. It increases the focal length of a lens by a factor of 1.4x while still delivering superb image quality. For instance, a 200mm lens with this converter will behave like a 300mm telephoto lens.
Specifications :
- EF Mount Teleconverter
- 1.4x Magnification Factor
- Microcomputer Controlled
- Communication Between Lens & Camera
- Spectra Coating Reduces Ghosting/ Flare
- Protective Fluorine Coating
- Dust and Water Resistant
- Compatible with Select EF Mount Lenses
This converter is only compatible with fixed focal length L-series lenses 135mm and over, as well as the EF 70-200/2.8L, EF 70-200/2.8L IS, EF 70-200/4L, and EF 100-400/4.5-5.6L. Additionally, please see the lens and/or camera body manual for full autofocus compatibility information with the Extender EF 1.4X III.