My favorite brush

Above is a Real Techniques brush.

Below is an Etude House brush.

The one above is quite soft. So I mainly use it often when applying powder. It doesn't sting, and the bristles are voluminous, so it is really convenient when applying powder.

The one below is a shadow brush, which I mainly use to blend out the edges of my eyeliner or to draw my eyebrows naturally with shadow.

Since I have used both of these products for a long time, I don't remember the prices clearly, but I think they were both on the cheaper side.