There are all sorts of different kinds of clips and clamps. The cheapest and most commonly available clamps are ordinary household clothespins; almost everyone has at least heard of the idea of using these on nipples.
Simple clothespins make good clamps for nipples, but can be used anywhere (provided your partner can take the level of pain inflicted). I most frequently use them on the underarms, around the breast, inner thigh and labia (pussy lips).
They come in different sizes, and can be wooden or plastic. Some have jagged teeth (serrated edges) at the end.
They’re pretty easy to find, too. You can buy them in many different places, Target, Walmart, and even Lowes. I also suggest you also check arts and crafts stores, because they often have a wide variety, including tiny ones.
Smaller clothespins tend to be stronger and more painful than larger clothespins. The drawback to clothespins is that it’s difficult or impossible to control how tightly they clamp, and for some submissives, they are too much. As always know her pain tolerance and limits, and introduce them slowly.
Have you used them or had them used on you? Other than nipples, where were they used? Was it a good experience?