I use a KUN brand shoulder rest and recommend it to all my students. There are a lot of cheaper imitations of this shoulder rest, but they are always problematic. Depending on your violin size, if you are using a 1/2 size and up, get a full size KUN and adjust it to fit. If the ‘feet’ wear out, you can replace only them. They also have the rubber sleeves for the feet as replacements. I have used my KUN for over 20 years, point being, they might seem pricey but they last. Another consideration is as you grow (if you’re still in grow mode) you will constantly have to re-evaluate the shoulder pad and how it’s working for you. Good luck!