Before buying kettlebells you need to make sure you feel comfortable teaching the correct form when using them. Many trainers buy equipment like kettlebells and they have very little or none experience using them, which makes it even more difficult for them to teach the moves safely to their clients. kettlebells and they can be pricey and they come in various weight sizes. Cueing is very important when instructing clients to use kettlebells.
As for where to buy them, Wal-Mart has kettlebells and they are relatively cheaper than the regular sporting stores like Dick’s or a similar one. You could also check on Craigslist for anyone who is selling their kettlebells and/or check stores that sell second hand equipment. Kettlebells are very durable and even if you buy them second hand, they will still be as good as new.