Canon's L series lenses are known for being high quality, durable optics that produce stunning image quality, but their prices tend to be quite high. However, I've always thought this Canon L lens is very well priced, and with this great deal, it's a total steal.
The 100mm f/2.8L Macro IS USM is an awesome lens. If you're thinking "cool, but I don't shoot macro," I don't either (though it's obviously great for that if you do). It's actually my portrait lens. It handles very well, produces crisp, sharp images, and has fast and accurate autofocus. As I discussed in my comparison of Canon's portrait lenses, the 100mm macro is my go-to choice, because it produces excellent results with a high level of consistency. It's also very light and the hybrid IS works wonders. It comes with a nine-blade rounded aperture for smooth bokeh and is also weather-sealed. I like it so much that I continue to use it for portraits even though I've switched bodies to the Sony a7R III. I purchased mine for $1,000 back in the day, and nowadays, the price is normally $899, which I still think is a great deal for the quality of optics you get with this lens, but for $699, it's a no-brainer. Get yours here.