They sure do. Not only is Black Friday a time when kettlebells and fitness equipment, in general, go on sale, but it might also be the best time of year to buy kettlebells, as most brands offer deep price cuts like never before during this time.They sure do. Not only is Black Friday a time when kettlebells and fitness equipment, in general, go on sale, but it might also be the best time of year to buy kettlebells, as most brands offer deep price cuts like never before during this time.