This set of Kabuki brushes from EcoTools is apparently a limited edition, but you can currently get it on Amazon for less than ten bucks.
They’re pretty small; the top photo has them next to a large mascara tube for reference. However, they are extremely dense and soft — very plush. They won’t replace any of your giant brushes or anything, but they do a lot of work. The box they come in has a guide to tell you what each brush is and how to use it, which is kind of handy since I have free floating anxiety that I am using all my beauty products wrong and will turn myself into some sort of monster.