If you’re looking for an affordable gouache brush set, the Biaelk 1610 Professional 10PCS, Face Paint Brushes, Synthetic Taklon Hair, Wooden, Bamboo Handle Artist Brushes Set is a great option.
Gouache paint is often called designers' gouache or opaque watercolour as it can be used like watercolour but is not transparent. It is opaque, dries quickly and produces a matt finish.