I could write a post about this or I could simply link you to a page that perfectly explains it all! Kettlebell Kings are highly respected and a reputable dealer of kettlebells. I appreciate their guidelines on purchasing and have chosen to share it:
That being said, I also like supporting local and have had great luck with REP Fitness located in Denver.
Let's get ready to learn some ballistic movements and see how kettlebells change things up for us!