If you want cheap kettlebells to find out if you like them, you may be able to find something on Amazon. However, my favorite brand if/when you are ready to invest in some is Rogue. Another place where you may be able to find kettlebells is on the facebook marketplace.
As far as what weight to start with it really depends on the person. For women, I’ve found a nice set of “starter” weights includes a 6 OR 8 kg, 12 kg, and 16 kg kettlebell. To convert kilograms (kg) to pounds, multiple the number of kilograms by 2.2.